My power supply's been having issues for a long while. (I assume it's the power supply, as nothing else really seems like it could have the same effect.) If I accidentally nudge my PC, or step on the floor in front of it just a little too hard, or breathe on it funny, it just... stops. The power stays on, the fans keep going, and hard drive activity seems to continue, but my monitor gives me a "no signal" message, and nothing actually happens on the computer itself (i.e. downloads stop running, music stops playing, etc). (A note: I'd previously thought that this was a RAM issue, but I replaced my RAM earlier this year and it still continued, so unless there's something majorly wrong with my motherboard's RAM slots, I feel confident naming the power supply as the cause of the problem.) I've gritted my teeth and just dealt with it since it started, but after I had to physically move my rig earlier today, it stopped turning on altogether. Except for once, but that seems to have been a fluke. I checked all the necessary power cables, I unplugged and reinserted all the required ones, and still nothing.
Situation A, I somehow fried my motherboard. Which would be practically disastrous.
Situation B, my power supply finally gave up the ghost. (I'm hoping it's this one, especially since I just bought a new one off Amazon.)
Situation C, it's something else, for which I have no means to test, since this is my one and only desktop and I don't have any spare core components lying around.
Anyone have any experience with something similar? I know there can be many, many causes for "The Computer That Wouldn't Turn On", but I'm just hoping I didn't overlook anything here.