The computer cannot be started.

My general inspection is like this

Now I don’t know what the specific problem is. There is no alarm sound, so consider the best solution first. Simple problems

For example, the memory stick is loose, or the motherboard cannot recognize the memory due to oxidation of the gold finger. At this time, unplug the memory stick, wipe it clean and then insert it

Start the computer, usually this will solve the problem

If it still doesn't work, if you have an independent graphics card, unplug it and wipe the gold finger. If the motherboard has an integrated VGA interface, you can use the motherboard's graphics card interface and wait for judgment. After identifying the problem, plug in the graphics card

If the problem cannot be solved by wiping the memory and graphics card, don’t panic. You can remove the COMS battery from the motherboard, cut off the power, and install it after a few minutes.

Sometimes the coms configuration changes due to hardware changes may also cause the computer to fail to boot

If these do not work, you must consider the motherboard or CPU problem

For cpu problems, first check whether the power supply is normal

The computer cannot enter the system when it is turned on. It can be divided into two situations: self-test but there is a hardware problem; if the self-test fails and the desktop cannot be entered, the problem is the system or driver. Question.

1. If I can pass the self-test but cannot enter the desktop, it is a problem with the operating system or driver:

Why does the computer repeatedly restart and fail to enter the desktop normally or get a blue screen of death?

When eliminating viruses, it is usually because the GHOST version or other modified version of the operating system is installed, and a large number of drivers that are not suitable for your hardware device are pre-integrated, causing the system to fail. It is caused by correctly identifying and loading the hardware devices necessary for the system.

This type of error can be corrected by re-downloading and installing the original image installation version of the operating system and installing all drivers with Microsoft WHQL certification.

p>

If you don’t want to reinstall, try booting F8 into safe mode and uninstall the incompatible driver of the hardware device (that is, right-click the device in the device manager)>Properties>The driver does not have>Digital Signature Program>Microsoft Windows Hardware Compatibility Publisher driver), after the hardware device is automatically recognized at startup, reinstall the driver you downloaded (WHQL) that has passed Microsoft digital signature certification, and then restart the computer again to see if there is any improvement.

< p>Then there is a conflict caused by software with duplicate functions in the system (such as the installation of 2 or more anti-virus software, firewalls, and ad blocking).

If it is confirmed that it is not the system or software. If there is a problem, you need to test the hardware in the following order. First, the memory is the most likely, then the CPU, then the hard disk, and finally the graphics card. The motherboard will basically not have a blue screen.

In addition, you need to check whether poor heat dissipation is causing the machine to overheat (if so, you must install a more powerful radiator, re-coat thermal grease, and replace a powerful fan).

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

You also need to check whether the chassis power supply is insufficient, causing the output voltage to be unstable (if so, it must be replaced immediately)

< p> If the power-on self-test fails and no "beep" sound is heard, there must be a hardware failure. A preliminary judgment is required from the alarm sound of the small speaker (buzzer) in order to narrow the scope of the hardware failure. Please refer to your computer for the specific meaning of the power-on alarm sound. Motherboard manual.

2. If the self-test fails, there must be a hardware failure:

What should I do if the computer starts the self-test but does not hear a "beep" sound?

If the computer fails to self-check after startup and does not hear a beep, there must be a hardware failure.

It is necessary to troubleshoot and check from the following aspects:

1. System The time cannot be displayed and saved correctly because the motherboard battery is insufficient. Replace the motherboard battery with a new one, and press the DEL key to enter the BIOS after booting to reset the correct system time.

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

3. Unplug the memory stick, wipe the gold finger with an eraser and reinsert it Return to the memory slot.

4. Reinsert all hardware and cables securely to avoid virtual connections.

5. Start the machine once with the case open and check the fan If it is running normally, it needs to be replaced.

6. Check whether the power supply of the chassis is insufficient. If you have a replacement power supply on hand, try replacing it.

7. Is there a hard disk failure? There may be bad sectors. Enter the BIOS to see if the hard drive can be recognized.

8. There is no signal on the monitor. Focus on checking the connection of the display part. If the monitor has a black screen or blurry screen, it may be a problem with the graphics card or the monitor itself.< /p>

9. Make a preliminary judgment based on the alarm sound from the small speaker (buzzer) of the boot case and your specific BIOS to narrow down the scope of the problem. Please refer to your motherboard manual for the specific meaning of the startup alarm sound.

10. That’s all I can think of for now. Other components will also be checked step by step using the substitution method or the minimum loading method.