1. If you don't know where the specific problem is and there is no alarm sound, consider the simplest problem first.

For example, the memory stick is loose, or the motherboard cannot recognize the memory because of gold finger oxidation. At this time, unplug the memory module, wipe it clean and then plug it in.

This usually solves the problem when you start the computer.

2. If it doesn't work, if you have a discrete graphics card, you should also wipe your golden finger after pulling it out. If the motherboard has an integrated vga interface, you can use the motherboard's graphics interface, and then plug in the graphics card after judging the problem.

3. Don't panic if the memory graphics card can't solve the problem. You can remove the coms battery from the motherboard, turn off the power and install it in a few minutes.

Sometimes, because of the change of hardware, the configuration of coms changes, which may also cause the machine to fail to start.

4. If all these fail, we should consider the problem of motherboard or cpu.

Cpu problem first check whether the power supply is normal.

5. When the computer is turned on, it can be divided into two situations: there is a hardware problem in the self-test, and whether the self-test can pass the desktop is a system or driver problem.

1. Self-check can pass, but it cannot enter the desktop. This is an operating system or driver problem:

Why can't the computer normally enter the desktop or crash the blue screen after repeated restarts?

In the case of virus removal, it is generally due to the installation of GHOST version or other modified versions of the operating system, because a large number of drivers that are not suitable for your hardware devices are integrated in advance, which leads to the system being unable to correctly identify and load the necessary hardware devices of the system.

This error can be corrected by downloading and installing the original mirror version of the operating system and installing all drivers certified by Microsoft WHQL.

If you don't want to reinstall, you can try to open F8, enter the safe mode to uninstall the incompatible drivers of hardware devices (that is, right-click the device in the device manager) > Properties > Presence > Digital Signature Program >: drivers of Microsoft Windows hardware compatible publishers), automatically identify the hardware devices after starting, reinstall the downloaded drivers (WHQL) that have passed the Microsoft digital signature authentication, and then restart the computer again to see if there are any improvements.

Then there is software with duplicate functions in the system, causing conflicts (for example, two or more software killers and firewalls are installed, and advertisements are blocked).

If it is confirmed that it is not a system or software problem, you need to test the hardware in the following order: first, memory is the most likely, then CPU, then hard disk, and finally graphics card. There will be basically no blue screen on the motherboard.

In addition, check whether the machine is overheated due to poor heat dissipation (if it is, it is necessary to install a stronger radiator, repaint the heat dissipation paste and replace the high-power fan).

Check whether the top of the motherboard capacitor is convex (if convex, it must be replaced immediately).

It also depends on whether the output voltage is unstable due to insufficient power supply of the chassis (if so, it must be replaced immediately).

If the power-on self-test fails and you can't hear a click, it must be a hardware failure. It is necessary to make a preliminary judgment through the alarm sound of the small horn (buzzer) in order to narrow the scope of hardware failure. Please refer to your motherboard manual for the specific meaning of power-on alarm sound.

2. If the self-check fails, it must be a hardware failure:

What should I do if I don't hear the "ticking" sound after starting the computer?

After the computer started, the self-test failed. If you don't hear the dripping sound, it must be a hardware failure.

Exclusion inspection requires the following aspects:

1. The system time cannot be dBIOSplayed and saved correctly, which is caused by insufficient battery power on the motherboard. This kind of fault can be solved by replacing the new motherboard battery and pressing DEL key to reset the correct system time.

2. Check whether the motherboard capacitor is bulging or leaking. If so, please go to a professional computer repair place to replace the motherboard capacitor.

3. Unplug the memory stick, wipe the golden finger with an eraser and plug it back in.

4. Reconnect all hardware and connecting wires firmly to avoid virtual connection.

5. Open the chassis and start it once to see if the fan is working normally. If it is not normal, please replace it.

6. Check whether the power supply of the chassis is insufficient, and replace it if there is a replacement power supply at hand.

7. Whether there is a hard disk failure will lead to bad track. Check the BIOS to see if the hard disk can be recognized.

There is no signal on the display, so it is important to check the connection of the display part. The black screen or flower screen of the monitor may be the problem of the graphics card or the monitor itself.

9. According to the alarm sound of the small horn (buzzer) of the boot chassis combined with your specific BIOS preliminary judgment, so as to narrow the scope of the problem. Please refer to your motherboard manual for the specific meaning of alarm sound.

10. That's all I can think of for the time being. Other parts are also checked step by step by substitution method or minimum load method.