Either it did or this is the worst case of bad timing ever.
This computer has been running without issues for quite a long time (a few years). There were no indications whatsoever that anything was wrong. Everything was fine and 100% stable, no weird noises, no crashes, nothing to indicate any problems.
Yesterday, I installed Windows 8. Today, just now, I was playing some Mass Effect 3, and boom, computer shuts off. No warning, no BSOD, just sudden loss of power. At first I thought it was a short blackout or something, but if that were the case, the PC should come back on after power's been restored (it's configured to turn back on automatically after power loss; also, it's connected via a UPS, so that really shouldn't happen).
But it didn't come back on. Pressing the power button did nothing. I checked all the plugs, moved it to a different power socket for good measure, still nothing.
Opening the PC, I see that switching on the PSU has two effects: the motherboard power LED comes on, and all the fans (CPU, GPU, case, and PSU fans) spin for about 1 second (actually, only the CPU fan spins briefly, the others just sort of judder). Then, nothing.
Fortunately, I still have my old PSU (which is an underpowered piece of * that could never run this system reliably, and that was before I upgraded my video card). When hooking up only the primary motherboard power connection, the fans work but nothing else happens. When hooking up the entire system, it now works fine. I just don't think I should play any games since I doubt this old PSU could handle the draw. So, despite not having any money, it looks like I'm going to need a new PSU.
So, is it possible for something Windows 8 did to fry the PSU? Or was this just a horrible coincidence?
Any recommendations for a new, not too expensive but high quality PSU? My current one is an Antec, I was very satisfied with it, never gave me any issues up to the moment it died ten minutes ago. I'll probably get a similar one unless anyone has a better idea.