The BIOS does not beep when the computer is turned on. No sound signal when turning on the computer: possible causes, expert advice. Useful video about bios signals
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In this article, we will try to independently diagnose a computer. And so, if when you start the computer, it does not start and emits various beeps, this means that the BIOS of the motherboard has detected errors in the operation of the equipment. Let's first understand what Bios is. BIOS is a basic input / output system, in other words, the firmware that is responsible for booting the computer. Versions of "bios" are different (AwardBIOS, Phoenix AwardBIOS, AMIBIOS).
Various BIOS versions.
If you want to find out detailed information about your Bios, it is enough to run the “System Information” utility in the operating system (START> PROGRAMS> STANDARD> UTILITIES> SYSTEM INFORMATION), or press the “DEL” or “F2” key when starting the computer, after which You will immediately be taken to the BIOS settings, usually the "Main" section. But what about when the computer does not start and emits various beeps. Usually, if the computer does not turn on and beeps, this means that some equipment is malfunctioning. Below, in the table, we will try to give sound signals for various BIOS versions with their description. And so we went:
Signals Phoenix AwardBIOS
| Signal type | Signal value |
|---|---|
| one short | |
| Two short | |
| Three short | Test error random access memory |
| Four short | Malfunctions in the motherboard (timer problems) |
| five short | Possible processor failure |
| six short | |
| seven short | |
| eight short | Problems with the video card |
| Nine short | BIOS Firmware Issues |
| ten short | |
| Eleven short | Malfunction in the motherboard, possibly damage to the cache memory chips |
AwardBIOS signals
| Signal type | Signal value |
|---|---|
| one short | The equipment has been successfully tested |
| Two short | CMOS settings gone wrong, or other minor errors |
| Three long | Malfunction in the motherboard |
| One beep and a blank screen | Problems with the video card |
| One long and one short | Memory problems |
| One long and two short | Problems with the video card or the monitor is not connected |
| One long and three short | Keyboard error, there may be problems with the keyboard controller |
| One long and many short | Damage to the BIOS chip |
| Permanent long | Memory problems (incorrectly installed, faulty), possibly motherboard does not support this type of memory |
| Permanent short | Problems with the power supply |
| No signals | Problems with the power supply |
Signals Phoenix AwardBIOS
| Signal type | Signal value |
|---|---|
| one short | The equipment has been successfully tested |
| Two short | Error while testing RAM |
| Three short | Error while testing RAM |
| Four short | Faulty motherboard (timer problems) |
| five short | Possible processor problems |
| six short | Faulty keyboard or keyboard controller |
| seven short | Malfunctions in the motherboard (virtual mode error) |
| eight short | Problems with the video card |
| Nine short | BIOS Errors or Damaged BIOS Chip |
| ten short | BIOS error, data in BIOS is not updated |
| Eleven short | Malfunctions in the motherboard, possibly damage to the cache memory chips |
After identifying possible motherboard or hardware problems, let's look at troubleshooting options.
Problems related to the operation of RAM.
If you have two memory cards installed, you can remove one of them one by one and thus find out which one is faulty, or if there is an additional card, replace it.
Video card related issues.
There are times when two video cards are installed on the computer, one integrated and the other external, in which case you can remove the external video card and connect the monitor to the built-in video adapter and thus find out which video adapter is faulty. You also need to remember that after removing the external video adapter, you may have to go to the appropriate BIOS section and enable the integrated video adapter.
Problems related to incorrect BIOS settings.
In such cases, it is enough to start the computer, if it still starts, go to Bios and load the default settings (Load Optimized Defaults) by pressing the F10 and Y keys. If the computer does not start and does not pass the hardware check, you can reset Bios manually. For this we need a screwdriver. We remove the left side cover of the system unit, find the CLEAR CMOS jumper (which has only two positions), set it to another position and start the computer, of course it will not start. Then we put the jumper in the previous position and try to start the computer. Perhaps, after these operations, you will have to go into the Bios settings and reconfigure them.
How to check a faulty power supply, we will consider in the next article.
The situation in which the computer allegedly turns on, but the image does not appear on the screen, although the fans are working, is the most common computer failure. In this case, very often on the screen is displayed.
There may be several reasons, from the most harmless, which will be solved by cleaning the contacts, then quite serious and costly, when you have to change the motherboard.
In this article, we will consider all possible options for diagnosing and fixing this malfunction at home, which will help you solve this problem yourself.
How to fix the problem and where to start?
Many may not believe it, but according to statistics, in 60% of such situations, the problem is corrected by cleaning the contacts and rearranging the RAM modules.
To do this, you need to turn off and open the system unit. Next, we find the bar / bars of RAM, remove it, wipe the contacts with a dry eraser or just with our fingers and insert it back.
One possible reason is poor RAM contact.
Let's try to turn it on. If there is no result, then you should try to put the memory module in the adjacent slot. If multiple memory modules are installed, try inserting them one at a time and in different slots.
It will not be superfluous to reset the BIOS settings for a few minutes.
Removing the battery on the computer motherboard
Also check if there are any swollen capacitors on the motherboard. If they are, then the problem is with the motherboard.
One reason is a swollen capacitor.
If cleaning the contacts and rearranging the memory modules did not work, then check if your motherboard is installed, which emits signals when you turn on the computer.
External computer speaker on motherboard
If there is a speaker, remove the RAM and try turning on the PC without it. Speaker silent? So things are bad. Most likely problems with motherboard, although it would be worth trying to change the power supply, borrowing it for a while from friends or neighbors purely for testing.
Location of the power supply in the computer case
If the speaker emits at least some sequence of signals, then by which you can decipher what the problem is.
If there is no speaker and there is no way to install it, then after the RAM, try changing the power supply to a known working one. Pay attention to whether the pins of the 4-8 pin processor power plug are burnt.
4 pin CPU power connector
Next comes the turn of the video card. As in the case of RAM, we remove it from the connector, wipe the contacts and insert it back. If there is a motherboard on the motherboard, then we try to turn on the PC from it by pulling out the discrete one.
The presence of a monitor connector on the back of the computer is a guarantee of the presence of an integrated video card on the motherboard
If none of the above helped, at the same time you checked the monitor, as well as the reliability of the cable connection and at the same time turning on the computer is displayed, then with a probability of 95% we can say that the motherboard is out of order and needs to be replaced.
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Good day ... With each new inclusion personal computer, the automatic POST (Power-On-Self-Test) self-test diagnostic program is launched. Which is “recorded” in the BIOS ROM.In this short post, I would like to give some examples of tables decoding PC signals. That is, computer beeps or what the BIOS beeps about.
To begin with, in order to use these tables, you will need to find out the BIOS manufacturer of your motherboard. It is quite easy to find out the BIOS manufacturer. You need to go into the BIOS itself, (description below) and find the manufacturer's signature.
A few words about the POST diagnostic program. This program checks all the most important components of a personal computer. Such as: processor health monitoring, CMOS. Supporting motherboard chips and of course it produces a quick test of RAM. All this information about the health of the PC, the computer outputs to the micro-speaker in the form of a BIOS sound signal, (beep).
If the POST program has successfully completed the diagnosis of the critical components of the computer and if the PC is in perfect condition, then you should hear one short beep. Then the download will start immediately. operating system. If a non-working component is detected during computer startup, the POST program will immediately give a certain sound signal (several short or several long beeps). Thus, it determines the detected error. Accordingly, the computer stops working.
How to enter BIOS Windows 7
In order to enter the BIOS with Winows 7 or XP, you need to press a specific key or set of keys immediately after turning on the PC. Accordingly, before loading the operating system of the computer itself.As soon as you pressed the restart button of the computer, you immediately need to press a certain key. Or a set of keys. It is advisable to click it before entering the BIOS menu.
Usually, a certain inscription in English is displayed on the monitor screen (press DEL to enter SETUP). Which talks about entering the PC settings. The Delete key is often used. There are also other hotkey options.
Keyboard Shortcut Options In Windows 7
- Ctrl+Alt+Esc
- Ctrl+Alt+Ins
- Ctrl+Alt
POST diagnostic programs and computer beeps
AWARD BIOS
| Beep sequence | Error Description |
| 1 short | Successful POST |
| 2 short | Minor bugs found. A prompt appears on the monitor screen to enter the CMOS Setup Utility program and correct the situation. Check the reliability of the fastening of the loops in the connectors hard drive and motherboard. |
| 3 long | Keyboard controller error |
| 1 short, 1 long | Random Access Memory (RAM) Error |
| 1 long, 2 short | Video card error |
| 1 long, 3 short | Video memory error |
| 1 long, 9 short | Error while reading from ROM |
| Repetitive short | Problems with the power supply; RAM problems |
| recurring long | RAM problems |
| Repetitive high-low frequency | CPU issues |
| Continuous | Problems with the power supply |
AMI BIOS
| One short beep | |
| Two short beeps | RAM test error |
| Three short beeps | RAM test error (first 64 kb) |
| Four short beeps | The motherboard is faulty, (system timer error) |
| Five short beeps | Processor defective. Try to remove the processor and install it again (if you are not afraid). If it doesn't help, then you need to replace the processor. |
| Six short beeps | The motherboard is faulty, (keyboard controller error) |
| Seven short beeps | The motherboard is defective (virtual mode error). Try restarting your computer, if that doesn't help, then only replacing the motherboard. |
| Eight short beeps | Faulty video adapter or video memory test error |
| Nine short beeps | BIOS ROM checksum error |
| Ten short beeps | Error writing to CMOS memory. It is necessary to "reset" the BIOSa memory, then by jumpering the two contacts located next to the battery (Clear CMOS), or remove the battery for 20 minutes by unplugging the power cord. If that doesn't work, you'll have to change the chip. |
| RAM errors. Try reinstalling the memory sticks. | |
| (One long and two short), (One long and three short), (One long and eight short) beeps | Video card failure. |
Dell BIOS
| One beep, pause, two beeps | Video card error. You need to check the connection of the video card |
| One beep, pause, two beeps, pause, two beeps, pause, three beeps | BIOS chip error |
| One beep, pause, three beeps, pause, one beep, pause, one beep | BIOS chip error |
| One beep, pause, three beeps, pause, one beep, pause, three beeps | Keyboard is defective |
| One beep, pause, three beeps, pause, three beeps, pause, one beep | |
| One beep, pause, three beeps, pause, four beeps, pause, one beep | |
| One beep, pause, three beeps, pause, four beeps, pause, three beeps | Memory check error. Worth a memory check |
| One beep, pause, four beeps, pause, one beep, pause, one beep | memory check error. Worth a memory check |
IBM BIOS
AST BIOS
| One short beep | The processor is defective |
| Two short beeps, (Three short beeps) | |
| Four short beeps | Keyboard is defective |
| Five short beeps | Keyboard is defective |
| Six short beeps | System board is defective |
| Nine short beeps | BIOS chip is defective |
| Ten short beeps | Timer chip is defective |
| Eleven short beeps | Chipset driver is faulty |
| Twelve short beeps | Non-Volatile Memory Power Failures |
| One long beep | DMA controller chip is defective (channel 0) |
| DMA controller chip is defective (channel 1) | |
| The video adapter is defective | |
| One long and three short beeps | Video adapter memory failure |
| One long and four short beeps | The video adapter is defective |
| One long and five short beeps | RAM is defective |
| One long and six short beeps | Memory interrupt vector loading errors |
| One long and seven short beeps | Video equipment out of order |
| One long and eight short beeps | Video memory defective |
COMPAQ BIOS
| One long beep | The POST diagnostic program did not find any errors, it works fine. All OK. |
| One long and one short beep | The BIOS memory checksum is incorrect. Battery needs to be checked |
| Two short beeps | General error |
| One long and two short beeps | The video card is defective. Video card needs to be reinstalled |
| Seven Signals | The AGP card is defective. Video card needs to be reinstalled |
| One long (repeating) | RAM is defective |
| One short and two long beeps | RAM is defective |
PHOENIX BIOS
The signals of this BIOS go through a pause with short beeps. For example - 1-2-1 (1 beep, pause, 2 beeps, pause, 1 beep)
| One beep, pause, one beep, pause, three beeps | An error occurred while accessing BIOS memory |
| One beep, pause, one beep, pause, four beeps | BIOS checksum is incorrect. Battery needs to be checked |
| One beep, pause, two beeps, pause, one beep | Motherboard is defective |
| One beep, pause, two beeps, pause, two beeps (One beep, pause, two beeps, pause, three beeps) | DMA controller chip is faulty |
| One beep, pause, four beeps, pause, one beep | Motherboard is defective |
| One beep, pause, four beeps, pause, two beeps | RAM is defective |
| One beep, pause, four beeps, pause, three beeps | System timer error |
| One beep, pause, four beeps, pause, four beeps | Malfunction of one of the I / O ports |
| Two beeps, pause, one beep, pause, one beep, (Two beeps, pause, one beep, pause, two beeps), (Two beeps, pause, one beep, pause, three beeps), (Two beeps, pause, one beep, pause, four beeps) | RAM is defective |
| Two beeps, pause, two beeps, pause, one beep, (Two beeps, pause, two beeps, pause, two beeps), (Two beeps, pause, two beeps, pause, three beeps), (Two beeps, pause, two beep, pause, four beeps) | RAM is defective |
| Two beeps, pause, three beeps, pause, one beep, (Two beeps, pause, three beeps, pause, two beeps), (Two beeps, pause, three beeps, pause, three beeps), (Two beeps, pause, three beep, pause, four beeps) | RAM is defective |
| Two beeps, pause, four beeps, pause, one beep, (Two beeps, pause, four beeps, pause, two beeps), (Two beeps, pause, four beeps, pause, three beeps), (Two beeps, pause, four beep, pause, four beeps) | RAM is defective |
| Three beeps, pause, one beep, pause, one beep | Second DMA channel failed |
| Three beeps, pause, one beep, pause, two beeps (Three beeps, pause, one beep, pause, four beeps) | First DMA channel failed |
| Three beeps, pause, two beeps, pause, four beeps | Keyboard controller is defective |
| Three beeps, pause, three beeps, pause, four beeps | Video memory is defective |
| Three beeps, pause, four beeps, pause, one beep | Monitor is defective |
| Three beeps, pause, four beeps, pause, two beeps | Video BIOS chip failure |
| Four beeps, pause, two beeps, pause, one beep | System timer is defective |
| Four beeps, pause, two beeps, pause, two beeps | End of the test |
| Four beeps, pause, two beeps, pause, three beeps | Keyboard controller is defective |
| Four beeps, pause, two beeps, pause, four beeps | Processor crashed while entering Protected Mode |
| Four beeps, pause, three beeps, pause, one beep | RAM error |
| Four beeps, pause, three beeps, pause, two beeps, (Four beeps, pause, three beeps, pause, three beeps) | Timer error |
| Four beeps, pause, four beeps, pause, one beep | Serial port failure |
| Four beeps, pause, four beeps, pause, two beeps | Parallel port failure |
| Four beeps, pause, four beeps, pause, three beeps | Math processor failure |
| Long repeating | Motherboard is defective |
| Continuous | The fan is defective (cooler) of the processor |
| Siren | Video card is defective |
Conclusion
Do not take this information as absolutely reliable. Because computer sounds may change as new BIOS versions are released. This concludes this post, I hope you find it useful...
I am often asked what it means BIOS beeps when PC is turned on. In this article, we will take a closer look at BIOS sounds depending on the manufacturer, the most likely errors and how to fix them. In a separate paragraph, I will tell 4 simple ways how to find out the manufacturer of the BIOS, and also let me remind you of the basic principles of working with hardware.
Let's get started!
1. What BIOS beeps are for
Every time you turn it on, you hear the computer beeping. Often this is the one that is heard from the speaker of the system unit. It means that the POST diagnostic program completed successfully and did not find any problems. After that, the loading of the installed operating system begins.
If your computer does not have a system speaker, then you will not hear any sounds. This is not an indication of a bug, it's just that the manufacturer of your device decided to save money.
Most often, I observed this situation with laptops and DNS desktops (now they release their products under the DEXP brand). "What threatens the lack of dynamics?" - you ask. It seems to be such a trifle, and the computer works fine even without it. But if the video card cannot be initialized, it will not be possible to identify and fix the problem.
If problems are detected, the computer will emit an appropriate beep - a certain sequence of long or short beeps. You can decipher it using the instructions for the motherboard, but who among us keeps such instructions? Therefore, in this article, I have prepared tables for you with the decoding of BIOS sound signals that will help you identify the problem and fix it.
In modern motherboards, the system speaker is built-in.
Attention! All manipulations with the hardware configuration of the computer should be carried out if it is completely disconnected from the mains. Before opening the case, be sure to remove the power plug from the socket.
2. How to find out the BIOS manufacturer
Before looking for a decoding of computer sounds, you need to find out the manufacturer of the BIOS, since their sound signals differ significantly.
2.1. Method 1
You can make "identification" in various ways, the simplest - look at the screen while loading. At the top, the manufacturer and BIOS version are usually indicated. To capture this moment press the Pause key on your keyboard. If instead of the necessary information you see only the splash screen of the motherboard manufacturer, press Tab.
The two most popular BIOS manufacturers are AWARD and AMI
2.2. Method 2
Go to BIOS. I wrote in detail about how to do this. Browse the sections and find the item - System Information. The current BIOS version should be indicated there. And at the bottom (or top) of the screen, the manufacturer will be indicated - American Megatrends Inc. (AMI), AWARD, DELL, etc.
2.3. Method 3
One of the fastest ways to find out the BIOS manufacturer is to use the Windows + R hotkeys and enter the MSINFO32 command in the Run line that opens. Thus it will be launched System Information utility, with which you can get all the information about the hardware configuration of the computer.
Launching the System Information utility
It can also be launched from the menu: Start -> All Programs -> Accessories -> System Tools -> System Information
You can find out the BIOS manufacturer through "System Information"
2.4. Method 4
Use third-party programs, they were described in detail in. Most often used CPU-Z, it is absolutely free and very simple (you can download it on the official website). After starting the program, go to the "Board" tab and in the BIOS section you will see all the information about the manufacturer:
How to find BIOS manufacturer using CPU-Z
3. Decoding BIOS signals
After we have figured out the type of BIOS, you can begin to decipher the sound signals, depending on the manufacturer. Consider the main ones in the tables.
3.1. AMI BIOS - beeps
AMI BIOS (American Megatrends Inc.) since 2002 is most popular manufacturer in the world. In all versions, the successful completion of the self-test is one short beep , after which the installed operating system is loaded. Other AMI BIOS beeps are listed in the table:
| Signal type | Decryption |
| 2 short | RAM parity error. |
| 3 short | Error of the first 64 KB of RAM. |
| 4 short | |
| 5 short | CPU failure. |
| 6 short | Keyboard controller error. |
| 7 short | Motherboard failure. |
| 8 short | Video card memory failure. |
| 9 short | BIOS checksum error. |
| 10 short | Unable to write to CMOS. |
| 11 short | RAM error. |
| 1 dl + 1 box | Computer power supply failure. |
| 1 dl + 2 kor | |
| 1 dl + 3 kor | Video card error, RAM malfunction. |
| 1 dl + 4 kor | The video card is missing. |
| 1 dl + 8 kor | The monitor is not connected, or problems with the video card. |
| 3 long | RAM problems, test ended with an error. |
| 5 cor + 1 dl | There is no RAM. |
| Continuous | Problems with the power supply or overheating of the PC. |
No matter how trite it may sound, but I advise my friends and clients in most cases turn off and turn on the computer. Yes, this is a typical phrase from the guys from your provider's technical support, but it really helps! However, if after the next reboot, squeaks are heard from the speaker that are different from the usual one short beep, then you need to fix the problem. I will talk about this at the end of the article.
3.2. AWARD BIOS Signals
Like AMI, one short beep AWARD BIOS signals a successful self-test and the start of the operating system startup. What do other sounds mean? Let's look at the table:
| Signal type | Decryption |
| 1 recurring short | Problems with the power supply. |
| 1 repetitive long | RAM problems. |
| 1 long + 1 short | RAM failure. |
| 1 long + 2 short | Video card error. |
| 1 long + 3 short | Keyboard problems. |
| 1 long + 9 short | Error reading data from ROM. |
| 2 short | Minor malfunctions |
| 3 long | Keyboard controller error |
| continuous sound | Power supply defective. |
3.3. Phoenix BIOS
PHOENIX has very characteristic "beeps", they are written in the table differently from AMI or AWARD. In the table they are indicated as combinations of sounds and pauses. For example, 1-1-2 would sound like one beep, pause, another beep, another pause, and two beeps.
| Signal type | Decryption |
| 1-1-2 | CPU error. |
| 1-1-3 | Unable to write to CMOS. Probably the battery on the motherboard is dead. Motherboard failure. |
| 1-1-4 | Invalid BIOS ROM checksum. |
| 1-2-1 | Faulty programmable interrupt timer. |
| 1-2-2 | DMA controller error. |
| 1-2-3 | Error reading or writing DMA controller. |
| 1-3-1 | Memory refresh error. |
| 1-3-2 | RAM test does not start. |
| 1-3-3 | Faulty RAM controller. |
| 1-3-4 | Faulty RAM controller. |
| 1-4-1 | RAM address bar error. |
| 1-4-2 | RAM parity error. |
| 3-2-4 | Keyboard initialization error. |
| 3-3-1 | The battery on the motherboard is dead. |
| 3-3-4 | Video card failure. |
| 3-4-1 | Video adapter failure. |
| 4-2-1 | System timer malfunction. |
| 4-2-2 | CMOS termination error. |
| 4-2-3 | Keyboard controller failure. |
| 4-2-4 | CPU error. |
| 4-3-1 | Error in RAM test. |
| 4-3-3 | Timer error |
| 4-3-4 | RTC error. |
| 4-4-1 | Serial port failure. |
| 4-4-2 | Parallel port failure. |
| 4-4-3 | Coprocessor malfunction. |
4. The most popular BIOS sounds and their meaning
I could make a dozen more different tables for decoding beeps for you, but I decided that it would be much more useful to pay attention to the most popular BIOS beeps. So, what are users most often looking for:
- one long two short BIOS beeps- almost certainly this sound does not bode well, namely problems with the video card. The first step is to check if the video card is fully inserted into the motherboard. Oh, by the way, how long have you been? After all, one of the reasons for problems with loading can be banal dust that has clogged into the cooler. But back to the problems with the video card. Try pulling it out and cleaning the contacts with an eraser. It will not be superfluous to make sure that there are no debris or foreign objects in the connectors. Does the error still occur? Then the situation is more complicated, you will have to try to boot a computer with an integrated "vidyuha" (provided that it is on the motherboard). If it boots up, it means that the problem is in the removed video card and you can’t do without replacing it.
- one long BIOS beep on power up- Possibly memory problems.
- 3 short BIOS beeps- RAM error. What can be done? Remove the RAM modules and clean the contacts with an eraser, wipe with a cotton swab moistened with alcohol, try to swap the modules. It is also possible. If the RAM modules are working, the computer will boot.
- 5 short BIOS beeps- Faulty processor. Very unpleasant sound, isn't it? If the processor was installed for the first time, check its compatibility with the motherboard. If everything worked before, but now the computer squeaks like a cut, then you need to check whether the contacts are clean and even.
- 4 long BIOS beeps- low speed or stop of the CPU fan. You need to either clean it or replace it.
- 1 long 2 short BIOS beeps- problems with the video card or malfunction of the RAM connectors.
- 1 long 3 short BIOS beeps- either problems with the video card, or problems with RAM, or keyboard errors.
- two short BIOS beeps – see the manufacturer to clarify the error.
- three long BIOS beeps- problems with RAM (the solution to the problem is described above), or problems with the keyboard.
- BIOS signals are too short- you need to count exactly how many short signals.
- Computer won't boot and no BIOS signal- the power supply is faulty, the processor is not working properly, or the system speaker is missing (see above).
From my own experience, I can say that quite often all problems with loading a computer are due to poor contact between various modules, such as RAM or a video card. And, as I wrote above, in some cases a regular reboot helps. Sometimes you can solve the problem, or by resetting the system board settings.
Attention! If you doubt your abilities, it is better to entrust diagnostics and repairs to professionals. You should not take risks, and then blame the author of the article for what he is not guilty of :)
- To solve the problem, it is necessary pull out the module from the connector, remove dust and reinsert. Contacts can be carefully cleaned and wiped with alcohol. It is convenient to use a dry toothbrush to clean the connector from dirt.
- Don't forget to spend visual inspection. If some elements are deformed, have a black coating or streaks, the cause of problems with loading the computer will be in full view.
- Let me also remind you that any manipulations with the system unit should be performed only when power off. Don't forget to remove static electricity. To do this, it will be enough to take hold of the computer system unit with both hands.
- Dont touch to the pins of the microcircuit.
- Do not use metal and abrasive materials to clean the contacts of the RAM or video card modules. For this purpose, you can use a soft eraser.
- sober evaluate your possibilities. If your computer is under warranty, it is better to use the services of a service center than to delve into the "brains" of the machine yourself.
If you have any questions - ask them in the comments to this article, we will figure it out!
Let's find out the reasons why the computer does not turn on: the speaker does not beep or beeps. That is, when the computer does not show any signs of life when the power button is pressed, or if it does, it is not what we would like. The reasons can be both the simplest - there is no power, or complex - the device (memory, HDD, etc.) has failed.
Before we start dealing with this problem, you need to check the simplest:
- Is there a plug in the socket
- Is the network filter enabled
- Is the light off?
- Pay attention to the monitor. Maybe the computer is turned on, but the monitor itself is turned off through the button or there is no power. Whether the cable from the monitor (VGA or DVI) is connected.
Of course, the above is mandatory for you to see what is happening on the computer, but sometimes users do not pay attention to these points, thereby creating other complexities that are more time-consuming.
220V does not come
Power may not be supplied to the computer if:
No voltage at input- for example, the socket is faulty. It's easy to check - connect from another outlet, or plug a known-good electrical appliance into this outlet. For example, a kettle, a hair dryer or a surge protector with an indicator. Usually it is with a surge protector that I determine whether the socket is working or not, if it is on, then everything is in order with it. We think further.
Behind the system unit, there is a special button on the power supply. You need this button to be in position "1" - on, if "0" - off. If this button is missing, then you do not take any action at this stage.
The power cord may come off- move it, or pull it out and reconnect it.
The cable itself is defective- ring it with a tester or indicator.If these tools are not at hand, you can take another power cable and replace it during the test. If the computer turned on, then the problem was in the power cable and you just need to replace it (the cost of the cable is about 100 rubles.)
So, we made sure that everything is in order with the cable, let's move on.
Monitor and video card
If you pressed the power button on the computer, it made noise - it turned on, then you need to check the cables from the system unit to the monitor. Very often, the cables come off the monitor, so you don’t see anything on the monitor, but in fact the computer is turned on and working.
From the system unit there must be a cable that transmits the image to the monitor and a cable from the surge protector that supplies power. If everything is in order with these cables, then pay attention to the video card (if you have an external one).
If the graphics card is faulty, the monitor will display a "No Signal" popup. For starters, it's worth checking the VGA or DVI cable, this is already what kind of connection you have. Check if it is firmly inserted, if the contact pins are bent. Pull out the video card and clean the contacts with an eraser.
If all else fails, try to pull it out and switch the cable to the video card built into the motherboard, if there is one, of course.
Iron malfunctions
It all starts with the power button, and we'll start with it. Now you need to open the cover of the system unit and look for breaks in the wires. Be sure to check it out!
BIOS signals
When you press the power button, the POST self-test program starts and if it does not pass (the equipment is not connected or bad contact), the download simply stops, and the speaker (speaker) starts beeping. Their sequence depends on the BIOS. They can be used to determine the source of the error.
You will always find these signals in my article: "". If you find out which device is faulty, try replacing it with another one, borrow it from friends or neighbors. In the event that everything works, you can buy this component.
Broken wire for the Power button
From my own experience, I can say that this problem is rare, but it should not be discarded to the last stage of testing. If you have a wire break from the Power button, then you will not turn on the computer and therefore make sure that everything is in order with the wire that comes from this button.
I once tested a computer that didn't want to turn on. It seems to have done everything possible, but there was no reaction from the computer. Then I removed the front cover from the system unit and found a broken wire there. In a couple of minutes I connected it, wrapped it with electrical tape and it unquestioningly turned on. Apparently, someone had already taken it apart before me and accidentally pinched this wire, thereby tearing it when the front cover was closed.
So, if you have removed the cover of the system unit, then do not be too lazy to open the front cover as well.
Power Supply
Now there is a choice to buy a power supply and of course people buy what is cheaper, because they think that this will not affect the operation of the computer in any way. If you buy a cheap Chinese power supply, then you can say that your computer will live next to a powder keg that can explode at the most inopportune moment.
Note: it is better to save money, for example, on a computer case and buy a normal power supply.
The power supply is a very important component in the computer, as it supplies energy to all computer devices. Therefore, if your computer does not turn on - a black monitor screen, then the power supply may be the cause of this breakdown.
In this section, we will experiment, but if you have a spare power supply or borrow it from another computer (neighbor or friend), then it is better to immediately connect another power supply to your computer. Thus, you will save your time. At a minimum, its characteristics should be the same as yours or better - it will be most correct. You can find all the data on the power supply on the sticker that is on it.
The very first thing you can do is unplug the power cable from: the drive, floppy and hard drive. Next, disconnect the video card, if you have an external one, and remove the RAM from the motherboard. Then try to turn on the computer. If the computer is buzzing, it turns on, then turn it off, connect one device, then turn on the computer, if it turns on, then connect another device, etc. You must understand which device did not allow the computer to turn on.
To check the power supply you will need a voltage tester. Eh, sighed users who do not have this device. I understand you, but still there are people who have purchased it, since electronics failure is not uncommon. We take a tester and a connector of any power that comes out of the power supply and measure the voltage. There should be 5V between black and red, and 12V between black and yellow.
If, when testing the power supply, the voltages differ from the numbers that I named above, then it's time to go to the computer store for a new one. By the way, there are allowable deviations when measuring voltage. Approximately 5% is allowed. If you have, for example, 11.9, then everything is in order with your power supply and you need to look for the problem elsewhere.
If you want a modern power supply, then buy 400 - 500 watts. Take the average.
Often problems arise due to the discharge of the battery, which is located on the motherboard. If you recently had cases when your computer lost time, then most likely you need to change the battery. The price of the battery is small and you can buy it at any computer store.
To check the battery, remove it and check the voltage in it or simply replace it.
If the computer beeps and does not turn on, then it is possible that the memory strips are faulty. There is also a small chance that the computer does not make any sounds due to the fact that the speakers are not working. Remove the memory from the slot on the motherboard and clean the contacts with an eraser. Put them back in place and try to turn them on, if it still does not turn on, pull them out again and stick one at a time. Perhaps one of the lines is faulty.
If there are other connectors on the motherboard that you did not use to connect the RAM module(s), then try using them.
BIOS
So, another option is what to do if the computer does not turn on. If you have recently made any changes to the BIOS, then now you need to return the default settings. Of course, the question is how to do it if you don't see anything?
You need to disconnect the battery from the motherboard, connect the power to the computer and press the power button several times. Next, leave the computer without a battery for 20-30 minutes and then plug it back in.
If some inscriptions appear on the monitor screen when you turn on the computer, but Windows does not boot, then you can go into the BIOS and find the function to reset the settings to factory settings. After that, do not forget to save the changes made to the BIOS by pressing the F10 button (usually).
Motherboard
So we came to the very last section of this article, as well as the most disappointing one - the motherboard. If your motherboard is broken, then its repair can cost a pretty penny.
If you are going to repair it, then think, is there any point? Sometimes its repair can exceed 50% of the cost and then the question arises, is it not easier to buy a new one?
So that you don’t have a question - why the computer does not turn on and what to do in this situation, once a year carry out preventive maintenance with it - clean out the dust and replace the thermal paste every 2-3 years (approximately). By the way, the dust in the computer greatly interferes with the operation of the computer, and once you have opened the system unit, then clean everything from the inside.