PC shutting down - please help me

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You could also look in the eventviewer log at that time of reboot if there are error messages:

run eventvwr

look in windows protocols for system and then filter for critical errors at the shutdown/restart time. There you will see the error code too.

Example image, in german, but you should get the clue:

lj1YQAh.png


The keywords entry is the windows error code and you can google that. Maybe it gives you an hint.

 
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Yeah Windows will log power down signals (I think it'll log bad psu signals, not too sure though), but either way if it's a Windows shutdown youll see it in the event viewer

But really, it sounds like a PSU issue. It can work fine sometimes sometimes not, but as soon as your computer detects power fluctuations (such as, falling below a certain voltage), you stop receiving a "power's good!" signal and get immediate shut down to prevent hardware damage. I don't remember what the voltage levels are on hand, but it's a built-in failsafe method in all psus. Why you can bridge the 20/24th pin with a paper clip and run your PSU - you're sending the "power's good" signal to it, pretty much

 
3.3 volt, 5 volt and 12 volt. I had a problem with my 3.3 voltage on an Asus board fluctuating too much even on a powerful power supply of 1000 watts. The Asus board would make an alarm sound and I used to see the 3.3 volt go below 3 volts and it would turn from yellow to red and the sound the alarm until I got sick of it and turned the alarm off. So if you can monitor your voltages with a motherboard or third party app that would help and look for the 3.3 going well below 3.3. My Asus board did a lot of reboots because of this in games.

https://openhardwaremonitor.org/ This might help.

I actually had this exact same thing happen last night on a new PC, but the motherboard is faulty so I am kind of sure that is the problem.

 
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