The motherboard does not make a sound when starting up. Deciphering the squeaks of the system unit when turned on. Compaq BIOS beeps

10.01.2022

If, when you turn on the computer, it suddenly turns out that its speakers do not make any sound, do not rush to get upset, you may be able to solve the problem on your own, without even contacting specialists.

To look for the cause of the lack of sound, it is necessary either in the hardware or in the software part of the computer. That is, the reason lies in the malfunction of any components, or in problems with the settings of the operating system.

To try to restore the sound on the computer, first of all, you need to establish the reason for its absence. It makes sense to start with the simplest. First, check if the speakers are powered on and connected to the computer, if the power LED on the front panel of the speaker is on, then simply restart the computer - it is quite possible that after that the sound will appear.

So, workshop: What to do if the sound is gone?

If there is no sound, find the speaker icon on the taskbar at the bottom of the computer screen. This icon must not be crossed out. If the icon is crossed out, it means that the sound on the computer is muted. To turn it on, right-click on the speaker icon, and in the window that appears, click “Unmute”.

In the same window, you can set the sound of the speakers by moving the sliders in the appropriate direction with the mouse.

If there are suspicions about the failure of the speakers, then you can check their performance by connecting to any other sound source that has an identical audio output connector, it can be a mobile phone, player, laptop, etc.

Another way to solve the problem with sound: open the "device manager", for example, in this way - Start Menu > Control Panel > System > Device Manager. Having opened the "device manager", make sure that the devices on the computer are recognized, that is, there should be no exclamation marks. If an exclamation mark is found, then there is a problem with this device. Go to the "properties" menu of this device, and try reinstalling the driver.

You can install a known-good sound card into the system unit if a discrete sound card is installed on the computer, that is, a separate, rather than built-in, sound card. If the problem was solved after that, then the reason lay in the sound card - it will have to be replaced.

The next way is to try to restore some previous restore point in the operating system when the computer was working normally. In the Windows 7 operating system, this can be done as follows: Start Menu > All Programs > Accessories > System Tools > System Restore”. Next, you just need to follow all the prompts of the computer, and select the date of the corresponding restore point.

A more time-consuming way is to reinstall the operating system. It is better to take this job if you have at least a little experience in this matter. If you have never reinstalled the OS on your own, then it is advisable to ask a knowledgeable friend to do this, or contact the service specialists. By the way, if all the above methods did not bring success, and the sound did not appear on the computer, then the computer definitely needs to be shown to specialists.

Every time the computer boots up, the system unit emits a squeak. Not everyone knows that this is a signal indicating the health of the system unit. And only a few know the decoding of these signals from the "system unit".

That's what we'll talk about. If you are reading this material, I recommend printing it now. When decryption is needed, it will not work to get out on the Internet. :)

So what is the "sistemnik" beeping about. These signals are the result of testing the computer hardware (there is a cooler, RAM, vidyuha, etc.). Every time you boot your computer, it tests the hardware, and reports the results with this very squeak. Deciphering the squeaks of the system unit below.

* One short beep.
Decryption:
Everything is fine. Test passed successfully. You can continue to work. It happens that some system units do not squeak at all at this moment.
* No squeak, no image on the computer screen.
Decryption:
Malfunctions in the power supply, or processor.
Correction:
First, check to see if the power cord is plugged into an outlet. If everything is in order, try connecting a known working device to the power filter (such a cord with a box in which there are many sockets, there is also a switch button, usually red). A phone charger is suitable, of course, with a phone connected to it. You need to check all the outlets of the power filter. If the outlet is working, the phone will charge. Next, we check if the power supply starts up when the computer start button is pressed. In this case, the cooler (fan) of the power supply should at least twitch. If there is movement - look for a new processor, otherwise - a new power supply. You also need to check the motherboard power cable. It may happen that he moved away.
* One long continuous beep.
Decryption:
Power supply defective.
Correction:
Purchasing a new power supply.
* Two short beeps.
Decryption:
Minor bugs in BIOS settings.
Correction:
Go into the BIOS and set the optimal parameters. Exit to the BIOS is usually done with the key. If you don't know what to change, then set the default values. To do this, press the button. To exit and save - , . Some versions of the BIOS themselves prompt conflicting settings items with backlighting. Also, you can reset the BIOS settings by removing the motherboard battery for a few seconds.
* Three long beeps.
Decryption:
The keyboard is missing.
Correction:
Plug the keyboard into the PS/2 socket. If this does not help, you will have to change the keyboard.
* Three short beeps.
Decryption:
RAM error.
Correction:
To do this, you need to check if there are memory strips on the motherboard. Don't laugh, it happens. Then you need to take out all the memory sticks, carefully sweep away the accumulated dust, and stick the memory stick in turn, and start the system unit. If on some bar the "system unit" squeaks, then this may mean that the bar is faulty.
* One long and one short beep.
Decryption:
RAM is not working properly.
Correction:
It is possible that one or more memory sticks are conflicting with each other. You need to alternately stick one stick of memory and try to start the computer.
* One long and two short beeps.
Decryption:
The video adapter is not working properly.
Correction:
Fix settings in BIOS.
* One long and three short beeps.
Decryption:
The video adapter does not work.
Correction:
Check the performance of the video card. To do this, you need another, obviously working video card. You can also try to remove the card, remove dust from the slot, and stick the card in place. And do not forget to check if the card has additional power plugs. Power to such video cards must be given by a separate cord to which no device is connected. I also suggest checking if the monitor is connected and working. Try blowing out the plug connecting the monitor to the computer.
* One long and eight short beeps.
Decryption:
The video adapter is not working or the monitor is not connected.
Correction:
Same as written above.
* One long and nine short beeps.
Decryption:
Error reading BIOS data.
Correction:
Try resetting the BIOS settings by removing the battery. If that doesn't help, then flashing the BIOS. But that's another story, requiring a separate article. I will try to write it as soon as possible.
* Four short beeps.
Decryption:
The system timer does not work.
Correction:
You can try resetting the BIOS. But, unfortunately, it rarely helps. There is only one way out - to change or repair the motherboard.
* Five short beeps.
Decryption:
The processor is not working properly.
Correction:
Try to clean the dust from the processor slot, make sure the heatsink is clean and the processor temperature is low.
* Six short beeps.
Decryption:
Keyboard defective.
* Seven short beeps.
Decryption:
Motherboard malfunctions.
Correction:
Send the motherboard in for repair, or purchase a new one.
* Eight short beeps.
Decryption:
Faults in the video memory.
Correction:
Take the video adapter in for repair, or purchase a new one.
* Nine short beeps.
Decryption:
Incorrect BIOS checksum.
Correction:
Usually it is proposed to reset the BIOS settings and allows you to work further. In which case, you can reset the BIOS by removing the battery.
* Ten short beeps.
Decryption:
Error writing data to the CMOS chip.
Correction:
This error can occur when flashing the BIOS. Therefore, we will describe this part in another article.
* Eleven short beeps.
Decryption:
The cache is not working properly.
Correction:
Reset BIOS. If this does not help, we carry the computer for repair, or install a new processor.
* Repetitive long beeps.
Decryption:
Faulty or incorrectly connected RAM.
Correction:
Reconnection of memory sticks. Calculation of the faulty, by connecting in turn and starting the computer. Dust cleaning.
* Repetitive short beeps.
Decryption:
The power supply is not working properly.
Correction:
Checking the performance of the power supply, checking the cords for breakage, checking the surge protector, and, last but not least, replacing the power supply.

That's all. There will be questions - ask.

PS: To reset the BIOS, instead of removing the battery, you can use a special jumper - a jumper. Its location can be found in the motherboard documentation.

Addition: BIOS signal encodingsif the computer died.
AWARD BIOS Signals

Continuous signal. Power supply defective.

2 short. Minor bugs found.
3 long. Keyboard controller error.
1 long + 1 short. Problems with RAM.
1 long + 2 short. Video card problem.
1 long + 3 short. A keyboard initialization error has occurred.
1 long + 9 short. An error occurred while reading data from the permanent memory chip.
1 long repeating. Memory modules are installed incorrectly.
1 short recurring. Problems with the power supply.

AMI BIOS Signals
There are no signals. The power supply is defective or not connected to the motherboard.
1 short. No errors found.
2 short. RAM parity error.
3 short. An error occurred during the operation of the first 64 KB of main memory.
4 short. The system timer is faulty.
5 short. Faulty CPU.
6 short. The keyboard controller is faulty.
7 short. The motherboard is faulty.
8 short. Bad video memory.
9 short. BIOS chip content checksum error.
10 short. Unable to write to CMOS memory.
11 short. External cache-memory (installed in slots on the motherboard) is faulty.
1 long + 2 short. Bad video card.
1 long + 3 short. Bad video card.
1 long + 8 short. Problems with the video card or the monitor is not connected.

PHOENIX BIOS Signals
1-1-3. CMOS data write/read error.
1-1-4. BIOS chip content checksum error.
1-2-1. The motherboard is faulty.
1-2-2. DMA controller initialization error.
1-2-3. An error occurred while trying to read/write to one of the DMA channels.
1-3-1. Memory refresh error.
1-3-3. Error when testing the first 64 KB of RAM.
1-3-4. Error when testing the first 64 KB of RAM.
1-4-1. The motherboard is faulty.
1-4-2. Memory test error.
1-4-3. System timer error.
1-4-4. Error accessing I/O port.
3-1-1. Error initializing the second DMA channel.
3-1-2. Error initializing the first DMA channel.
3-1-4. The motherboard is faulty.
3-2-4. Keyboard controller error.
3-3-4. Video memory test error.
4-2-1. System timer error.
4-2-3. Line error A20. The keyboard controller is faulty.
4-2-4. Error while running in protected mode. The CPU may be defective.
4-3-1. Error while testing RAM.
4-3-4. Real time clock error.
4-4-1. Serial port test error. The error may be caused by a device using this port.
4-4-2. Parallel port test failed. The error may be caused by a device using this port.
4-4-3. Error while testing math coprocessor.

When connected to the network, the computer emits a beep. This is how the hardware informs the user that it is ready to work. But sometimes the computer emits a series of beeps at various intervals, and flatly refuses to boot. This indicates an existing problem, and the problem may lie in the software, or mechanical damage.
You can find out the cause of the malfunction by the frequency and frequency of sound signals

However, it is difficult for an ordinary user to understand this alphabet, so we decided to make an article where the decoding of Bios signals will be given.

What are the beeps talking about

If the computer beeps when turned on, then everything is not so bad. At least the motherboard is fine. Much worse if . This indicates system problems that can only be fixed in the workshop. If the hardware is buzzing, you need to try to find out the cause. Some breakdowns can be repaired on their own. It is worth noting that the malfunction may be software or technical in nature. In the latter case, having heard a squeak, you need to check that the computer is connected correctly. The power cord may have come loose or there may be no power. In the latter case, the computer does not turn on.

If the connection is normal, the system unit is buzzing, but the image does not appear, you are dealing with a software failure. But you can try to clean the computer from dust. They do it like this:

We remove the front cover of the system unit (the computer is disconnected from the mains), take out the RAM and video card.

fig.1. Slots of seized devices should be cleaned with a soft brush

fig.2. We remove pollution from the memory card and video card

We insert the parts into place, and try to turn on the computer.

If the download was successful, then the reason was dust that clogged the contacts of the motherboard. If after cleaning, the computer continues to beep, then the problem is more serious than it seemed at first glance. Perhaps the power supply is faulty or the software has crashed. In any case, it is recommended to give the computer for diagnostics to a service center.

Important! The computer beeps with any system malfunctions. If you know what the series of beeps means, you can fix and possibly fix the problem.

Table of sound signals

The signals at the start of the computer are a kind of Morse code, with the help of which the hardware communicates with its owner. There is a Bios signal table with which you can decipher beeps. You just need to find out which BIOS version is installed on your PC, check the table below, and determine the cause of the beeps

bios award

One short beep indicates successful system boot.
Two short ones - minor software errors. The computer may advise you to use the CMOS program, and will display the appropriate message on the monitor.
Three long Bios beeps indicate problems with the keyboard. You need to check if the connection is correct.
1cor/1long The error is caused by RAM.
1dln/2kor. Video card. It is recommended to remove it from the slot and purge the contacts.
1dln/3kor. Video memory.
1dn/9box ROM not being read.
Alternating short beep. Power supply or RAM not working.
Intermittent long beep. RAM error.
One continuous signal in a different range. Power module or CPU failure.

Bios Pheonix

1~1~4: Problem with BIOS checksum calculation.
1~1~3: CMOS memory cannot be opened.
1~2~1: Motherboard beeps.
1~3~1: RAM is not regenerated.
1~4~2 or 1~3~3: RAM error signals.
1~4~4: One of the unit's ports is not working.
1~4~3: The system timer is not initialized.
2~1~1: If the computer first beeps twice, pauses and repeats the signal several times, this indicates a malfunction of the RAM. Usually, these are reading errors.
3~1~1 (2): Do not connect DMA channels.
3~2~4: The keyboard is not connected correctly.
3~3~4: The computer cannot handle graphics. Video card or memory failure.
3~4~1: The monitor is not recognized. Incorrect connection or technical malfunction.
4~2~2: System test completed signal.
4~2~4: CPU crit. Switching to safe mode is not possible.
4~4~1: Embedded ports sequence failure.
Long continuous sound: critical damage to the motherboard.
Continuous squeak of various tonalities: the cooling system has failed.

Note: the symbol ~ marks the intervals between beeps.

Bios AMI

One long beep indicates the successful boot of the operating system.
Two short beeps indicate incorrect installation of RAM modules.
Three short beeps: RAM loading failed. For troubleshooting, you can check if the RAM is installed correctly.
Four short beeps indicate problems with the system timer.
Five repeated signals indicate a malfunction in the central processor.
Six intermittent beeps: Incorrect connection or keyboard malfunction.
Seven beeps: the motherboard is faulty. The reason may be mechanical damage or contamination of the system unit.
1dln/4kor: no video card. Eight short beeps indicate problems with the memory of the video card.
Nine short beeps indicate an error in calculating the BIOS checksums.
1long/8short: Check if the monitor is connected properly.
The computer does not make sounds, no messages are displayed on the monitor. Critical CPU damage.

If the computer freezes when turned on, then this is a software malfunction. In this case, one short beep is heard when the computer is turned on, indicating that the system is booting normally. But the operating system hangs at the boot stage. It is possible that the computer does not see the bootloader. Faced with such a situation, you need to check the BIOS boot priority. It is possible that the download from digital media was set by mistake. To fix the problem, just reset the boot options.

Diagnosing a computer malfunction is not such a difficult task if the device's motherboard is working properly and there are no problems loading the BIOS. The base system, whose task is to determine the process of booting a computer, serves as an excellent diagnostic tool if you can read the information it provides.

The BIOS has its own language that the system uses to communicate with users. The beeps (squeaks) emitted when the system is booted are a kind of "Morse code", and they can be used to determine the malfunction, if deciphered correctly. When the computer beeps and does not turn on, you should immediately determine the type of BIOS that is installed on the motherboard. To do this, press the Del button on the keyboard immediately after turning on the computer. The BIOS will start, and it will be possible to determine its type, and then, based on the description of the signals, the computer user can easily determine the malfunction that the base system indicates with the help of squeaks.

If the diagnostic signals of any underlying system can be compared to Morse code, then this is the Phoenix BIOS. Its creators have developed their own system for notifying the user about errors, which is based on the supply of short alternating signals. You need to "read" them as follows:

1-2-1: malfunctions in the motherboard. It is recommended to remove the battery from the board and leave it de-energized for 20-30 minutes. After that, the battery is reinstalled, and you can make a new attempt to boot the computer;
1-3-1: errors in reading information from memory modules. The RAM needs to be replaced. If several modules are installed in the computer, you can leave one and try to turn on the computer, determining in this way the memory chip that is faulty;
1-4-1: problems with loading the motherboard, it may need to be replaced. It is recommended to restart the computer, and if the problem is not resolved, then disconnect and reconnect all elements;
1-4-2: The motherboard cannot read data from the RAM. Check the correct installation of the modules, as well as the slots in which they are installed;
1-1-3: there is a problem when reading information from the CMOS memory. In such a situation, it is recommended to replace the battery that is responsible for powering the CMOS memory.
1-2-3: problems occur in the data link associated with DMA memory. In such a situation, it is recommended to replace the motherboard;
1-3-3/1-3-4/4-3-1: checking the information coming from the first 64 kilobytes of RAM leads to an error. In such a situation, it is necessary to remove all memory modules from the system unit and connect them one by one in order to determine the die that causes the problem. If one RAM module is connected to the motherboard in the system unit, it needs to be replaced;
1-4-3/4-2-1/4-3-4: the malfunction is related to the system timer, which is responsible for the operation of the motherboard. In such a situation, you can reset the timer by removing the battery for half an hour, and then installing it again. If the procedures performed did not allow you to get rid of the problem, you will need to replace the motherboard;
1-1-4: errors occur when loading the Phoenix BIOS, which is flashed to the Flash card in the motherboard. It is necessary to flash the memory card or replace the BIOS chip;
1-4-4: the problem arises with the ports of the motherboard responsible for the input / output of information. It is necessary to check the connection of the mouse, keyboard, monitor (if it is connected directly to the motherboard). It is recommended to turn off all connected devices and turn on the computer, connecting them one by one in order to find the I / O element that is causing problems;
3-1-1/3-1-2: the fault occurs during the DMA channel test phase. In this situation, you will need to replace the motherboard;
3-1-4: an unspecified error in the operation of the motherboard. In such a situation, it is recommended to disconnect all components from the board, remove the battery from it and leave it without power for 30-40 minutes. After that, the battery and all the elements are installed in place, and then the system is started. If it was not possible to solve the problem in this way, the motherboard will need to be replaced;
3-2-4/4-2-3: the malfunction is caused by the connector and the controller for connecting the keyboard. The motherboard cannot receive information from the input device. If the error persists on reboot, the motherboard may need to be replaced;
3-3-4: The problem is with the computer's video card. If the video memory is built into the motherboard, you will need to replace the motherboard or install discrete graphics and try to start the computer while the monitor is connected to it. If your computer already has a discrete graphics card, make sure it's properly connected;
4-2-4: motherboard diagnostic systems have detected problems on the side of reading data from the central processor. It is recommended to check the socket for bent legs;
4-4-1: an error in the operation of the RS-232 port, which is better known as the "serial port". Most often it is used to connect an uninterruptible power supply. To diagnose the error, try disconnecting all consumers from it and starting the computer;
4-4-2: a legacy error that indicates a problem with the parallel port. It was previously used to transfer data from a printer to a computer, but now such ports are not provided on mass motherboards, and if you need to connect a printer to a parallel port, adapters for the USB connector are used;
4-4-3: the motherboard cannot read data from the math coprocessor. If the error persists after restarting the computer, the motherboard may need to be replaced.

Please note that the above are the most common diagnostic beeps that the Phoenix BIOS emits. In total, the base system software contains more than 100 commands, but the remaining ones are much less common, and they indicate, for the most part, errors in the operation of class A lines on the motherboard.

A motherboard with an Award Base System BIOS version can report various faults with the following signals:

1 short beep, repeating every second: there are problems with the power supply. You should clean it from dust and try turning on the computer again;
1 continuous beep, repeating every second:. Remove the memory modules and install them again;
1 short beep: standard diagnostics carried out by the motherboard, and no errors were found. After one short beep, the computer should turn on;
Continuous beeping of the computer: and does not perform its functions. It is possible that incorrect ;
2 short beeps: The diagnostic system has detected problems in data transfer between computer elements. The basic BIOS system in such cases prompts the user to run the CMOS Utility, a program through which you can turn off the need to check some computer components. In those situations when, when turned on, the computer beeps 2 times, it is necessary to check the reliability of fastening of all cables, especially those that transmit information from the motherboard to hard drives;
3 long beeps: An unexpected error occurred while the motherboard was processing information from the keyboard controller. In such a situation, it is recommended to restart the computer, but if this does not help get rid of the problem, the motherboard will need to be replaced;
1 long beep and 1 short beep: RAM is determined by the computer, but data cannot be read from it. It is recommended to check the memory modules for correct connection. If your computer has more than one memory module, leave one and try to start the computer;
1 long beep and 2 short beeps: The motherboard is not receiving data from the graphics card. The probable cause of the problem is the incorrect installation of the video card or the lack of a monitor connected to the video card port;
1 long beep and 3 short beeps: the motherboard cannot determine the keyboard connection, you need to check the reliability of the connection;
1 long beep and 9 short beeps: unable to read the information recorded in read-only memory (ROM). You should try restarting your computer. If the error is observed again, the contents of the storage device must be reflashed, but not all motherboards support the software update mode for this component.

Award BIOS beeps are distinguished by their distinctness. It is easy to diagnose a computer malfunction using them, if you know what they mean.

Diagnostics of a computer malfunction in the AMI BIOS is implemented using short and long signals, which is what this base system resembles Award BIOS.

Short signals:

1: The motherboard has diagnosed all the components that are connected to it, and the computer has started to boot. This signal is standard for error-free operation of the system;
2: there are problems with connecting the computer's memory modules. It is necessary to check at what positions the memory is installed, and if several dies are inserted into the computer, it is recommended to insert them one at a time and start the system to determine the faulty module;
3: as well as the previous error, this one indicates problems while reading data from RAM. The solution to the problem is identical to the situation with 2 beeps;
4: the system timer of the motherboard has gone astray or has failed. It is necessary to remove the battery from the motherboard and wait half an hour until the information is reset to factory settings. Then you can reinstall the battery and turn on the computer;
5: The motherboard cannot receive information from the CPU. Check the processor for physical damage. If it was not possible to determine the problem visually, a processor replacement will be required;
6: no information is received from the keyboard controller. First, check that the input device is securely connected to the connector. If there are no problems with this, it is necessary to replace the keyboard or the motherboard itself, depending on which device is out of order;
7: The motherboard cannot start booting due to an unspecified problem. Its replacement is required.
8: computer video card (built-in or discrete) work with errors. Check the reliability of the connection if it is a discrete video card;
9: information written in the BIOS is not read. In such a situation, you will need to flash the motherboard or replace it;
10: The problem is caused by the inability to write information to the computer's CMOS memory. The repair for such an error is to replace the CMOS chip, which is often more expensive than buying a new motherboard;
11: The motherboard software cannot read information from the external cache.

Combined signals:

1 long and 8 short beeps: in most cases, in this way, the BIOS reports that no data output device, that is, a monitor, is connected. It is recommended to check the reliability of the connection;
1 long and 3 short beeps (2 short beeps): The computer's video card is defective or not properly connected. You need to make sure that it is securely installed in the required slot and that all necessary wires are connected to it.

If the computer beeps when turned on and does not boot, it is necessary to determine the nature of the sound, and then proceed to troubleshoot. Most often, the problem is a poor connection of components or a malfunction of the motherboard itself.

It happens that the computer suddenly stops turning on, or the lights are on, the speaker (a small speaker built into the system unit or the motherboard, which performs a service function to inform about the processes occurring in the system) squeaks, and the monitor screen is treacherously black ...
Let's look at all the possible options and procedures for the above symptoms. Moreover, it is very desirable to carry them out exactly in the sequence in which I will give them:

1. The computer does not turn on at all, otherwise skip this step.

1.1 Check if it is connected to the mains (!), if it is switched on, whether the power cord is suitable for it (including the monitor). Do not take this as disrespect towards you, it's just really one of the mistakes that novice specialists make - first they climb inside, and then it turns out that there is no light in the house or the wire is not plugged into the outlet. This is what I wrote from myself. Remember - one of the features of professionalism is a clearly structured sequence of actions, starting from simple to complex.

1.2 We checked the power supply, pulled all the wires, the reaction is the same - it does not work. We go further, namely, we sniff the power supply (we just sniff with our nose). It often happens that the computer's power supply simply fails. Most often this happens without smoke and sparks, but the smell of burnt wiring still begins to be present in it, so if you feel this specific smell, it makes sense to think about replacing the power supply with a working one. By the way, I would like to immediately note that it is better not to save on the power supply, because. expensive power supplies (costing from one and a half thousand rubles or more), in addition to providing cleaner power and filtering it better from interference, they also install protection that allows you to save the life of the computer stuffing even if the power supply burns out from large voltage surge. Manufacturers of NONAME power supplies in the price category of 300-500-700 rubles like to save on this, thus, having saved a thousand on a power supply, you can lose fifteen due to the fact that it will burn all the insides.

1.3 Did you notice any foreign smells? We disconnect the power cord, after that we briefly touch with any hand something that has a ground (for example, a steam heating battery) - this is required in order to remove a static charge from your body, if any. Remember this simple method and be sure to use it if you need to get inside the system unit. If you discharge not on the battery, but on the motherboard, for example, then the cost of repairing a computer can increase significantly. Now we arm ourselves with a Phillips screwdriver (any one, even the tightest Chinese one, will do - there will be no serious loads on it) and unscrew the screws that secure the cover on the left side of the system unit (if you turn the system unit with its back to you, it will be right) and we take it off. Here I must make a reservation - I am describing the classic box of the system unit, if you have a fashion power supply that has undergone modding modifications, then it can open in a completely different way. If you do not know how, then read the instructions for your box. So, we opened the system unit, now our task is to find the wires there, going from the power supply to the motherboard - there can be from one (on old systems) to three (on new ones). Moreover, one of them is a wide 20 (24)-pin block, the second (and third, respectively) are four-pin. We need to remove them and insert them back into the motherboard. It happens (this disease happens in ATX systems) that the contact in the block just leaves the motherboard. After that, connect the power to the system unit and press the power button. If the power turns on, then you can collect everything and put it back under the table, if not, I advise you to try the option with a known-good power supply. If this does not help, it is better to contact a specialist.

2. Option number is the following - when you press the power button, the lights turn on, the computer starts to "make noise", but the monitor screen does not show anything.

2.1 We listen to the speaker beeping.

2.1.1 One short beep - this means that the system is working and you need to check the connection of the monitor to the computer, as well as whether the power is connected to the monitor and whether the monitor itself is working, and, as practice shows, anything can happen.

2.1.2 One long beep and three short beeps - the video subsystem is faulty. Usually this is due to the fact that one of the contacts of the video card just came off, in this case, guided by paragraph 1.3, we disassemble the computer, unscrew the video card, remove it, insert it back, screw it on and check. If the problem is solved, we collect everything back and rejoice. If not, then we try to insert a known-good video card, or contact a specialist.

2.1.3 Three long beeps, or long beeps do not stop - a problem with RAM. Guided by paragraph 1.3, we disassemble the computer, remove and insert the memory into place. You can try inserting memory sticks into adjacent ports (if there are free ones). Then we turn on the computer, if the problem is solved, then gladly, if not, we try to leave the memory sticks one at a time (everyone can get the flu at the same time, and the sticks rarely fail together) - this should help. If not, see a specialist!

2.2 Everything "beeps", but nothing "beeps" - Perhaps you simply do not have a speaker connected. Find the instruction manual for your motherboard, and, not forgetting to follow paragraph 1.3, disassemble the system unit, find a black flat plug with the inscription Speaker and black and red wires coming out of it and plug it in according to the instructions. Repeat step 2.1. Didn't find one or the other? - To a specialist, so as not to harm. Or try to finally pull out all the wires and cables and plug them back into their original positions - this also sometimes helps.

Afterword to the article

This article does not aim to make the readers of computer technology gurus, however, if you follow the instructions above, in 80% of cases it is possible to restore the computer to working capacity (in my own experience). And be sure to make sure that too much dust does not accumulate inside the system unit - dust is one of the sources of problems when working with a computer for two reasons. Firstly, this is a serious obstacle to effective computer cooling, and secondly, dust, when it accumulates a lot, becomes weak, but still a conductor of electric current, which also cannot but affect the stable operation of the computer. In other words, it may or may not kill, but it can become the reason for the strange behavior of the computer.