The power of the system unit is often turned off. What is the problem?

Question

Power Supply

From 1 to 10 times a day, the power of the system unit is turned off, that is, everything in the system unit is simply cut down and the monitor goes out. I did not notice any connection with something else, for example, system load. Appears in Windows and Ubuntu.
Is it possible to tell from my description what it is connected with?
Do you think that if you just replace the power supply, the problem will go away?
Thank you for your attention. Hope for help.

Answer 1

Check your CPU cooler... probably shutting down due to overheating. Another possible problem is in the power supply, if there is another power supply nearby, plug it in and test it for a day. It is advisable to check the sockets.

Answer 2

The first step is to go into the system logs and see what's wrong there. I had similar situations for the following reasons
* CPU overheating (see the temperature in the load and without)
* GPU overheating (see the temperature)
* Dust created additional capacity on the motherboard with the case (vacuuming)
* I installed Nero Essential on my head, one of the components of which (Gear something there) shamelessly buggy, hung up and brought down the entire system. (remove garbage from the system)
* Excessive electrification of the case can also cause a reboot (remove static with special means)

Answer 3

Each computer power supply has protection that instantly turns off the power supply if there is not enough power (1), or one of the output voltages is out of range (2).*
Most likely, it is.
But it is necessary to exclude failures in the operation of the motherboard, and software shutdown.
To do this, it is necessary to close the black and green wires in the power supply connector with a leash (for example, from a twisted pair). It goes without saying that the connector must be included in the motherboard, and the computer does not need to be disassembled into components.
After such an operation, the motherboard and programs will not be able to turn off the power supply. And if the power supply still turns off, this will mean the reason: insufficient power of the PSU (1), or a malfunction of the PSU (2).
Just keep in mind that there is a very small chance of damaging your computer. For example, the same static. If it's scary, then it's better to trust the professionals.
* The lack of PSU power is just manifested and detected by the power supply in the deviation of the output voltages from the norm.

Answer 4

Is it possible to tell from my description what it is connected with?
With difficulty, to be honest) Is everything inside outwardly normal? The cooler didn't fall off, or something?

Answer 5

There are two options:
- Problems with cooling (the processor cooler is dusty),
- Problems with power (there is not enough voltage, try disconnecting unnecessary devices).

Answer 6

And also check the USB ports, maybe where it is broken and closes two contacts.

Answer 7

since you don’t see any connection with the load, here are the options:
1) the motherboard is faulty
2) the RAM is faulty (Memtest86+ will help you)

Answer 8

Computer shutting down or restarting? How old is the computer? If it reboots and the computer is more than a year old, then check the temperature under the BIOS or in Windows, try warming up the piece of iron with some test. You can also see what the critical temperature is.
I also have a Gigabyte GA-945M-S2 motherboard, it seems that it is simply defective and reboots itself 1 or 2 times a day, I attached it to the HTPC for this.
In general, if the computer is old or the cooling system has been changed, check the temperature.
If the computer worked fine, the temperature was within the limits, and for no reason at all it started to fail - dig the PSU or the mother.

Answer 9

Faced this problem twice. The first time the motherboard was damaged. For the second time, the processor overheated. (Last summer it was hot, I clamped it for additional cooling).

Answer 10

Checking for a short circuit is very simple.
You disassemble the computer and assemble it on the table (but not on the carpet, especially if it is fluffy), preferably on a pimply bag from the motherboard or on antistatic, then test with inspiration. If the problem persists, then it is not a short circuit.
Well, then carefully assemble it so that there are no screws lying around, and one by one connect the cords from external usb, ports for sound, etc.

Answer 11

Just in case, check if the capacitors on the motherboard are "swollen".
Often, due to overheating of the electrolyte, the top covers of the power capacitors are slightly (and sometimes not slightly) undermined, which leads to instability

Answer 12

There may not be enough power - try temporarily cutting off the left periphery such as secondary screws, DVD drives, flop drives, expansion cards.
I also somehow observed similar glitches due to the cheap Asus case. The power was sometimes cut off or the computer went into reboot spontaneously and when reconnecting usb devices. It also didn’t start if I put an IO Shield for the motherboard on the back - as if something was short. I never found the exact cause, but a simple case change solved the problem.

Answer 13

Check the directory with logs
/Windows/System32/winevt/Logs/
In particular, in this file with hardware events, events generated by devices are written to this log: HardwareEvents.evtx

Answer 14

I have a similar situation. Turns off by itself. Then I took out everything except the wire on the PSU. And when you click on the system unit, the sound of sparks from the PSU.
When pressed ... I just pressed the body with my hand. There is a short somewhere in the block. The most important thing is that there can be short.