I'd like to apologize in advance if I posted this in the wrong section, but here goes:
I built a new computer about 4-5 months ago and it's recently been restarting randomly. There hasn't been a particular pattern to it, whether the system is under heavy load (gaming) or if I've just got Firefox open. I tried a refresh of Windows 8 and it seemed as if the restarts stopped for some time but it began several days after the refresh. Post-refresh, I did not install any applications other than Steam, Firefox, and Skype, though I am unsure if a windows update might have caused all this, as I have no way to systematically test for a software issue.
Windows 8 Pro (64bit)
Sabertooth 990FX R2.0 Motherboard
Asus GTX 670 4gb
Corsair AX850 PSU
Caviar Black 1TB HDD
Kingston Hyper X 3k 120Gb SSD
Corsair Vengeance 8gb (2x4gb) 1600mhz
Any help in figuring this out would be GREATLY appreciated. As I said above, I have no way to systematically test for a software issue, but I haven't exactly ruled out a hardware issue either. The one thing I can say is that I haven't seen the system temperature rise particularly high under load or when non-stressed, so I doubt over-heating is a problem.
I've attempted to run any game I can, but the system as reached the point where it is restarting before it ever reaches a load point. Previously, the GPU would rest at around 20-30C when idling, and go up to 70 when under load. The CPU temp was around 18-23 though I think that may have been an inaccurate reading under core-temp. I am going to attempt to refresh my Windows 8 installation again, and see if the restarts stop.
After the refresh I will be turning off all updates, and hopefully I'll get some results.
The refresh was completed, but shortly after, the computer restarted. No windows updates were installed, and the only thing
that was installed was Guild Wars 2 for the sake of putting the system under some stress. Also, I am unsure if it is simply some glitch, but both screens flashed for a moment,
then windows returned except with the background turned black, instead of it's usual picture.
Update: Managed to run furmark and stressed the video card until it hit about 75C. I'm not sure how good of a test that is in terms of PSU stress or video card stress, but I suppose if it is a good test, things have been narrowed down to memory/mobo/cpu? Does anyone have any thoughts/insight/help?