So I've been having the same problem as some other people in this forum I've noticed. I just bought a whole bunch of new components and used a few from my old PC, pretty much just the PSU being the only one of significance. Everything seems to be working fine normally but every now and again I'll be in a game and the whole PC just shuts off without warning. I've tried using WhoCrashed but there are no logs being made of these crashes. I only have errors on windows reporting saying windows was not shut down properly. But it is a catch all error and I don't know if it's stemming from heat issues, hardware issues, or power issues. Or if it could be something besides those. Here is what I can tell you: It only happens when I'm in a game, although that is 99% of the time since I almost exclusively game. But never when I'm on my browser or watching movies. Also, I have run memtests and my RAM appears to be all right. I thought it might be a power problem because although I have an 850 watt PSU, it is a corsair (Corsair HX850W) and I heard some people saying they are not very good? I would get a new PSU if I was sure it was that, but I'd like to be sure. I have many monitoring programs like OCCT, WhoCrashed, Speccy, RealTemp, and CPUID hardware monitor, OpenHarddwareMonitor, and Prime 95. Let me know if you want screenshots or log from any if that helps. Here is my speccy profile: http://speccy.piriform.com/results/bpZfMwd6a1BRgmmRlESRtfp
Thanks in advance for any help.