Computer completely freezing

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Soldato
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Over the past month or so I've had issues with my windows 10 install where it completely freezes. The two monitors go black (Not on sleep mode though, still on), music plays for a second before also stopping, no keyboard response, can't toggle the caps lock lights, and the screen on my G15 also freezes. A simple reboot and I'm back in windows again and everything runs fine again for a while, but since this is happening almost daily it's getting rather frustrating. I've tried updating my graphics card and network drivers to no effect, and short of a full reinstall I'm not sure what else to try.
Unfortunately, since it isn't windows itself crashing there aren't any minidump files created to try and find the root of the problem, and since the freezing seems to be pretty random I'm not sure what to do to find the culprit.
Heck, I just turned my PC on from cold 5 minutes ago and it froze while writing this post out.

System: Windows 10 x64
Gigabyte Z97x-Gaming 7 (With the wonderful killer E2200 network)
R9 290
i7 4790k running stock speeds currently.
 
I hadn't been monitoring CPU temps, however it generally happens while idle, I don't think it's actually frozen while gaming. It usually happens when I leave the PC on overnight, and sometimes while I'm using it. Did just install realtemp though and it's showing 31C across the 4 cores.

GPU drivers I've been uninstalling, restarting, uninstalling the windows 10 attempt at installing drivers, installing the latest then rebooting again. I've always been somewhat wary of drive cleaner programs, since didn't they cause issues where it mucked the registry up and stopped new drivers even being installed again?
 
Well, just froze again :(
At this rate I think I might just go and do a full reinstall. Will windows 10 complain if I format and reinstall to my C:/ ?
 
Hard drive was set to turn off after 20 mins, so I think I can rule that out since I've had it freeze within 5 mins of a cold boot. It's not set to sleep or anything like that either.
 
I'm using a logic g930 headset, so it has its own USB driver thing rather than a sound card. Think I also disabled on board sound in the bios as well.

Going through my order history, pretty sure the power supply is an ocz stealthxstream 2 700w bought in April 2011, so it's certainly showing its age. But if it was the power supply, wouldn't it be more likely to happen during gaming and other times of high load rather than while idle?
 
The headset is wireless, and I leave it turned off overnight and the freezes still happen then. I'll try unplugging the receiver and seeing if that helps.

Unfortunately I don't have a spare PSU to test, but I hadn't realised just how old it is, so it's probably time I replaced it anyway.
I'll also try running memtest overnight. Didn't think it could be a ram issue since I think that would cause lots of different problems rather than the same one over and over, but worth a try. And if it somehow freezes while running memtest that would narrow it down to a hardware issue.
 
Well, memtest ran mostly fine. Gave an error about high frequency row hammer bit flips, though a quick google says this is basically an issue with DDR3 ram in general and not really an issue.
Then left the system running overnight with the receiver unplugged and it still froze. Next plan is the complete reinstall now. Otherwise, I have no idea what could be causing the issue, so not sure what component to replace.
 
It was a fresh install.Still, compared with running Linux for a couple of days, I figured a full install would be far less painful! Besides the sudden collapse of my raid array it's gone smoothly (separate thread in general hardware trying to sort that one out!). Just got to see if it starts crashing again now.
 
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