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My PC shuts down and won't turn back on for a day or so

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Lesh

PCHF Member
Dec 7, 2020
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Hello there. I have encountered a weird problem with my PC (at least to me, who has low knowledge of how PCs actually work).

I will describer the problem first:
Twice now, during the PC usage, it has completely shut down. No BSD. Just shuts off. And it won't turn back on. After a day or so of trying to turn it on once in awhile, it magically turns back on.

Now to go into more detail:
In both cases, this has happened while playing Doom: Eternal. I am hoping that this isnt a problem with the graphics card, but a problem with the power supply. Simply because a power supply is cheaper to replace then a graphics card. I know for a fact that it isnt a problem with overheating. The first time it happened, I unplugged the PC immediately and checked the power supply. It was warm like an old coffee. No signs of burnt areas around the components or signs of oxidisation.

With the help of my grandpa who used to be a simple electrician, we took apart the PC, checked every connection from the power supply. Unplugged it and plugged it back in. In some areas used what he called "connection" fluid. Cleaned the whole case of dust. Tried to turn it on. Nothing. Next day, I had the idea to unplug a component and one at a time, try to turn the PC on. That was to try if it actually the power supply or a different component preventing the PC from launching. It is important to note, that during this time, if you plugged the PC back in, it clearly took power, because the lights flicked. Also, pushing the power button would light up the "Turned on" light and send electricity to the power supply. The fans would spin up for like a second and then die down. Pressing the power button again wouldnt do anything and you would have turn the power supply on and off again and same thing would happen.

Back to the components. I was unplugging them one by one. PC still didnt turn on. Then I got to the cooling fan attached to the CPU. I unplugged it and the PC actually turned on after I connected it and pressed the power button. To test if it a problem with the cooling fan and not the power supply suddenly jumping back to life, I unplugged the GPU. And the power supply turned back on again. So I plugged everything back into the system and it turned on AGAIN. Baffled by what just happened, I take my PC and start using it normally again. I monitored it using OpenHardwareMonitor. There were no signs of overheating or overload on all of the components. I turned Doom: Eternal on and look at the stats too and no spikes in overheating or overload again. So I went on and used the PC as normal, sometimes checking for abnormalities.

After 2 days, it happened again. During my playtime with Doom: Eternal, the PC completely shut down and wouldnt turn back on. This time, after "resetting" the power supply, it wouldnt even spin up the fans. It was just dead. After a day of waiting, I am here again. The PC back on and me typing this post on it.

I am very baffled by all this. I suspect it is the power supply. But before I make any monetary decisions, I wanted to see if anyone from here might have a better idea or suggestion on what might be the cause of all of this. Maybe even just nudge me in the right direction, because I know how incredibly hard it is to deal with hardware problems online.

If you need any photos, files or details, go ahead and ask. I will take all the help I can get. No problems.
 
So others can assist

Can you post the brand and model name or number of the power supply (PSU).

Download then run Speccy (free) and post the resultant url for us, details here, this will provide us with information about your computer hardware + any software that you have installed that may explain the present issue/s.

To publish a Speccy profile to the Web:

In Speccy, click File, and then click Publish Snapshot.

In the Publish Snapshot dialog box, click Yes to enable Speccy to proceed.

Speccy publishes the profile and displays a second Publish Snapshot. You can open the URL in your default browser, copy it to the clipboard, or close the dialog box.

When they system does not turn on what color flash pattern does the power indicator show?
 
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