Generally due to the following reasons:
1, the computer system is poisoned or infected with malicious software. When it is turned on, it will automatically shut down if it encounters a serious error;
2, cpu fan is broken, cpu temperature is too high, overheating protection. (The CPU fan is not working properly, and the overall temperature of the chassis is too high. , so you can replace the CPU fan and open the cover plate of the chassis to solve the heat dissipation problem of the machine); The possibility of automatic shutdown is 80% that the CPU is overheated. Check your fan, and the function of preventing intelCPU from overheating will start.
3. The power supply is broken, or new hardware is added, and the power supply is insufficient. Will the power be cut off every time the chassis, power socket and computer desk are moved? If so, please check the power connection. The power supply in this area is unstable. When the voltage is too high or lower than the minimum working voltage of the host power supply, the host will also protect it from turning off.
4. The video card or the video card fan is broken. Memory problem, serious memory error leading to system crash, pulling out memory,
5. The motherboard is broken and the motherboard core is overheated. Thoroughly clean the dust in the main cabinet.
6. Electrostatic interference. Can you get an electric shock if you touch the metal part of the chassis shell? When measured with an electric pen, it shows electricity. If so, please ground the chassis.
7, boot, press F8 to enter the safe mode, to determine whether it is caused by software or driver.
8. There is something wrong with the power setting. Right-click the computer-Properties-Performance Information and Tools-Adjust the power settings-Select the time to turn off the monitor (or Start-Control Panel-Hardware and Sound-Power Options-Select the time to turn off the monitor), and change the "10 minutes" of "Turn off the monitor" to a longer time or "Never".
9. Other reasons, such as a problem with the chassis power switch, such as the failure of the reset spring, are equivalent to frequently pressing the start button if the chassis power button does not respond, so that the computer will automatically power off after a few seconds.
There is a short circuit fault in the CD hard disk and other accessories.
Summary: According to the normal work after power failure and restart, this is a normal phenomenon: it belongs to the self-protection function of the system.
Because there is an automatic power-off protection function in the bios settings of the motherboard, that is to say, when the computer is overloaded or encounters other situations that damage the CPU or system, this information will be fed back to the motherboard chip in time and reacted. Because the bios has this protection function, in order to protect the CPU from damage, the system will automatically power off.
It is estimated that your computer needs to be cleaned up. This situation is usually caused by overheating or overload of the CPU due to long-term operation of the computer. Too much dust will lead to poor heat dissipation and overheating of CPU, leading to power-off protection. After cleaning the dust and solving the heat dissipation problem, the fault can be eliminated.
I don't understand myself. I suggest taking the computer mainframe to the brain maintenance department and asking the maintenance man to test and replace the power supply and memory module for you. If not, there is something wrong with the motherboard.