So, my desktop that I built, with the help of you folks
, has a strange issue that's cropped up: It turns off with no fanfare.
It's only done so twice. But, once it has, it doesn't turn back on. I've unplugged and re-plugged all the cables. Nothing. Last time, I took it to GeekSquad (I have no spare parts to troubleshoot with) to do some diagnostic, but it turned on right away for them and then turned on right away for me when I got it home. Last night, it just shut off, and hasn't yet turned back on.
I did note the CPU heat sink was loose (I've tightened it again), but it should do a thermal shutdown and should have come back on, as I understand it, once it's cooled off with no more effort than my pushing the power button.
So, I'm thinking it may be the PSU that's to blame. How can I check that the PSU is the culprit?