My computer turned on for about 2 seconds and turned off automatically, and then pressed the power b

1. Hardware method judgment:

1) Check the capacitor C and inductance L components around the motherboard filter circuit, if there is a capacitor slurry leakage (bulging), the voltage will be unstable, so the computer will restart for no reason;

2) If the power supply of the shoddy chassis does not reach the rated power, it will also cause automatic restart for no reason;

3) Poor contact between the power cord and the power outlet of the wiring board or chassis;

4) The mains voltage is unstable, it is recommended to buy a stabilized power supply or UPS power supply with voltage stabilization function, which can not only stabilize the voltage but also solve the impact caused by sudden power failure.

5) The hardware is incompatible, you can use 3DMark01 version 07 version to test the stability and compatibility of the CPU graphics card; and ramcheck to test the CPU as well as memory;

2. Software Failure:

1) Turn on the computer and press the F8 key to enter the safe mode, delete all the temporary files (here refers to the temp that installs all the files and the temporary files of browsing the web), install the antivirus software with the latest virus database, (it is recommended that Rising or Kaspersky Lilac can be free**) to check and kill, install the latest 360 security guard to check and kill the Trojan, eliminate the possibility of remote control, and patch the whole system.

Disassemble the chassis and see, is the capacitor on the motherboard bulging? (Very small cylinders, there are many, quite obvious) bulging or something leaking out, that is, the capacitor bursts, just take it and change a few capacitors.

Also, does the system have an alarm sound? For example, the sound of dripping. It may also be that the memory is not plugged in properly, but there will be an alarm sound.

First of all, unplug the memory and change it to a new slot, and pay attention to wipe the gold finger! If the problem is not solved, then there is a problem with the power supply, and there must be no mistake. You can change the power supply and test it, and there will be no other problems.

The weather is too hot, the silicone on the CPU is not enough, there is a problem with heat dissipation, and some motherboards have an automatic protection function, so it doesn't work, and you can re-wipe some silicone. Silicone is very cheap, just two or three pieces.

I can't solve it remotely, so let's go to the maintenance department.

I don't understand, it may be the motherboard, and the CPU may also be. Nothing else is possible.

There could also be a problem with the power supply.

I think it's the power supply melting, and I recommend checking the power supply, and if there's no problem with the power supply, look at the motherboard.

Is there a problem with the electronic control capacitor and if the motherboard is too dirty, this problem will also occur.

Here's how to fix it:

Change the power supply, plug and unplug the memory, graphics card, see if there is a reflection, if there is an alarm phenomenon in the middle, it should be one of the reasons, if the fault is still there, please see below;

The biggest possibility of failure to turn on and no alarm, that is, the most doubtful is: power supply, CPU and motherboard, because as long as one of these three pieces of hardware is faulty, the motherboard cannot be started, and the motherboard will not alarm if it is not started. Faulty is not necessarily a faulty accessory, but a poor contact is also a fault.

Solution: Unplug and unplug the CPU to troubleshoot;

If it can't be solved, open the case, find the connection cable of the boot button on the motherboard, unplug the boot key cable, and then use any conductive object to contact the two needles after the boot button on the motherboard is unplugged, and the computer will be turned on. However, in general, most of them are the problems of the boot button, because the switch is used frequently, and it is easy to have such a failure.