What is the reason why the computer sometimes restarts by itself when it shuts down?

Generally, there are more problems with automatic computer shutdown!

This is a few cases:

1. Normal shutdown, that is, the screen prompts the shutdown state"It's safe to shut down or something"

This is usually the result of system and software problems!

2. Illegal shutdown is the same as a power outage, there is no warning, and the screen will go black!

This is usually a problem with the hardware and the power supply.

There are also some problems in between, such as voltage instability and so on.

In response to your problem, I think it is software, generally because the system does not match the installed software. Like some software, the machine is a little more demanding, and what will be prompted when you start it!

And if your system doesn't provide the performance it needs, it will often restart.

1.Poisoned! Uninstall the antivirus software again, and then reinstall the antivirus software to see if it succeeds.

Be sure to prompt that the installation is successful, to the last step, the middle prompt is successful, most likely for poisoning! Reinstall the system, or kill the virus in safe mode! Some viruses are pretty powerful!

2.If there is a problem with the system, it is recommended to reinstall the system.

3.If this has not happened to the machine before, and the machine has not been moved or collided recently, the possibility of hardware problems is very small!

I suspect it's a problem with the power supply, my classmate's previous computer also had this kind of problem, I started to buy UPS, I still have this kind of problem, after changing the power supply, there is no such situation, you can change your classmate's power supply first, try to see if this kind of problem will appear.

I have encountered this situation a few times, it is the capacitor of the motherboard burned, check which capacitors on your motherboard are bulging, it is recommended that you take it to the place where you repair the computer to replace the broken capacitor, ** not expensive, at most spend twenty or thirty yuan on it.

Some are caused by viruses, or they may be caused by overheating of the CUP or Northbridge chip, if you haven't cleaned the inside of the host for a long time, please clean up the dust from the CUP heatsink.

Disable the auto-restart in boot and failback.

In the advanced level of system properties.

Purpose: To restore the default values of the BIOS settings and eliminate the automatic reboot or shutdown of the BIOS cooling presets.

2. If the computer shuts down automatically when using a certain application software, the automatic shutdown failure may be caused by this program software, and the program software can be uninstalled.

3. Then check the power supply, the power supply quality is poor, aging or the power is too small, which can not meet the power supply needs of the computer accessories, and the high-power and high-quality power supply can be replaced.

4. Then use the elimination method to check the memory, graphics card, CPU, CPU fan, motherboard, etc.

5. Check the memory, the memory quality is not up to standard, poor heat dissipation, overclocking, mixing and inserting of different brands of memory and the CAS value setting is too low, etc., which can cause the computer to shut down automatically, and the memory parameters can be adjusted accordingly in the BIOS.

6. Check the motherboard, the motherboard aging, capacitor failure or pulp, the motherboard power pins, the motherboard and the chassis backplane short circuit can cause automatic shutdown, you can take the motherboard out of the chassis to check or test, then check whether the CPU fan rotation and the CPU temperature is normal, and then check whether the bottom of the CPU fan heatsink is dry, if it is dry, clean the silicone on the CPU fan, and then recoat the good silicone. If the fan is not normal, replace the CPU fan.

7. Cleaning method: It is a method to eliminate faults by cleaning the dust of the parts in the computer host. Dust is one of the factors that can also cause computer automatic shutdown failures, dust can cause parts aging, pin oxidation, poor contact and short circuit and other failures.

For these faults caused by dust, it is generally more effective to use the cleaning method.

8. The power supply system is unstable, which can also cause the occurrence of automatic shutdown faults, and a UPS backup power supply with voltage stabilization function can be considered.

Common fault diagnosis methods for motherboard (motherboard failure can lead to power failure and shutdown fault):

The structure of the computer motherboard is relatively complex, the failure rate is relatively high, and the fault distribution is also scattered. According to the source of the fault, motherboard faults can be divided into power supply faults, bus faults, component faults, etc. The main causes of motherboard failure are as follows:

1. Component reasons: The quality of chips and other components on the motherboard is not good, resulting in aging and damage to the motherboard, resulting in motherboard failure.

2. Human reasons: When using the computer, hot-swap the hardware at will or touch various connectors with metal objects indiscriminately, resulting in the failure of the motherboard.

3. Dust and static electricity causes: due to dust or static electricity, the motherboard is in poor contact, short circuit or burns the chips on the motherboard, resulting in the failure of the motherboard.

Causes of poor contact: Poor contact of various chips, sockets, and interfaces in the motherboard due to rust, oxidation, weakened elasticity, pin desoldering, breakage, etc., resulting in motherboard failure.