Recently my PC has been deciding to shut down by itself every so often, once it does it will not turn back on for 10-15 minutes (it flashes on but will not boot). Once I can turn it on it will run for 10-20 minutes and the entire thing will happen again.
I was wondering if it could be a PSU problem? Overheating PSU? Or maybe overheating RAM?
My CPU never goes above 42C, and the internal temp, according to CoreTemp and SpeedFan is around 39-40C.
The shut downs tend to occur under load at first, like while playing a game (Starcraft 2, Left 4 Dead, etc)
If it is RAM, and I shange these settings, will it send me a pop up when the error occurs or where do I look?
Also, just a random noob question... I always thought when a PSU went bad the PC just wouldnt turn on. But it is possible that it'll run for awhile and turn off at other times? Will it just being to turn off more frequently if the PSU is at fault?
I do believe the issue is your PSU, as you say it just shutdowns without warning.
By disabling the auto-start, if you get a BSOD, it will be on your screen until you manually restart. This will help with troubleshooting. Yes, your PC can be working and just shutdown. Over time it will get worse to the point it won't start at all.
As for RAM, you need to verify your memory is set to the correct (timings, voltage & Mhz) settings in your BIOS to match your sticks than run MemTest86+ overnight to see if you get errors.