Computer crashes then gets caught in a power cycle loop and won't boot for a day

Sep 18, 2018
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My computer shuts down randomly while working from home. Nothing too intensive, just several Chrome tabs and a couple Office documents open. Sometimes it BSODs but usually not. When it shuts off like this, it starts back up but then shuts off again after 5 seconds or so, and it's just a continuous loop. It doesn't even get to the BIOS screen. Then I can't get anything to come back up for several hours, usually the next day. I have to kill the power at the psu switch or my outlet to get it to stop. When I try to plug it back in and turn it on, it stars looping again.

I thought it was an overheating issue as my stock cooler wasn't making good contact and needed to be replaced. I removed everything Friday, cleaned out the dust, installed the new cpu cooler and put it all back together. It worked great Saturday. I logged over 5 hours and cpu never got over 60c. I thought the problem was solved. Then Monday it shut off again and it had been running for less than an hour.

I'm about out of ideas. The computer is getting old, 6+ years; it was my first custom build. It hasn't given me any problems until recently. A month ago there was an issue with the display driver that would cause it to crash after about 5 minutes of running, but it didn't do the power cycle loop. I did a system restore and haven't had that problem anymore. This is something different.
 
What CPU loads are you getting on idle vs. In use? Are there any spikes?

Is your PSU hot to the touch?

What are your specs?

Try and install Driver Booster 5 to help you on any drivers you're missing out. As well as your GPU drivers. Also uodate your Moyherboard BIOS. Basically anything that could use an update.
 
Sep 18, 2018
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No, PSU isn't hot to the touch. Unfortunately, I can't get cpu loads anymore. It was rarely over 50% when I was watching it, unless it was right after boot and Windows was doing all the stuff it does at startup.

Don't laugh at my build, lol. It's over six years old. It has a Gigabyte P67 motherboard, i5-2500k running at stock, 16GB DDR3 1333MHz, OCZ SSD boot drive, WD data drive, a Gigabyte GTX 550 Ti, and a 650 W Corsair PSU.

I just checked (a day later) and it's still doing the boot power cycle. I've been reading other posts on here with similar problems. I'm thinking now it may be a PSU failure or there's something shorting it out. I just took it apart and reassembled 80% of it last week, so I'm leaning more toward the PSU. Only thing I didn't take apart was removing mobo from the case.