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BSOD PC Randomly Reset/Shutdown
Few weeks (after Intel spectre announcement and windows update) ago my system started randomly restarting and shutting down (cutting off) so I reinstalled windows and everything was fine until a week back, where it started resetting again and more frequently. Sometimes the monitors cut off and pc is running and I have to hard reset. Sometimes it resets on its own. Sometimes it just cuts off. I noticed that some of the SATA ports on my motherboard stopped working and will at times randomly detect/not detect my HDD.
It restarts randomly, sometimes when I'm playing games and sometimes when nothing is running at all.
The PC is over 4 years old (GPU 3 years) and I hope its not a motherboard/PSU/GPU issue as warranty has passed.
Note that I sometimes run my PC for extended periods of time and it works fine, but it suddenly resets and once it does it resets quite frequently
I do not have access to additional GPUs/mobo/CPU/PSU to test.
I play overwatch a lot, and I've encountered a reset only once so far.
I develop using unreal engine and have encountered more resets while using it.
Sometimes windows sound (device unplugged sound) plays when the screen goes black. Once when the screen went blank, i had music playing and the audio was looping, so I'm sure the PC crashed then.
When the PC restarts, its is as if pressing the restart button and this happens most of the time. The least frequency between restarts was around 5 mins. It doesn't restart immediately after login.
Once when the screens went blank I pressed the power button and my pc went to sleep. When I put it on again only my primary screen alone worked and the resolution was set to 1024x768 and I could not change it. It said the display driver failed to start.
I tried running a stress test (OCCT) for 1 hour to see if my psu/gpu was failing but it did not reset then. It randomly restarted the next day though. (I shut down during that night)
I did not realise that there were BSODs happening sometimes because my monitors went blank, but when I checked my event viewer I noticed a minidump.
No artefacts on screen and no flickering of any sorts.
When I see my temperatures on corsair link the cpu is around 39-45 idle and goes to about 65 on load. GPU idle is 50 on idle and 80 on load
When I check the wattage power draw on my UPS it rarely exceeds 350 watts. While playing overwatch its around 150 watts.
Thank you for taking the time to read my post. Please help me identify and solve this issue I'm facing.
Things I have done :
Reinstall OS (again)
Run memtest (pass)
Remove overclock
System
Windows 10 Pro 64 Bit
Intel i7 4770k @ stock clocks with corsair h100i
Asrock Extreme 6AC
4x4GB memory
Zotac Nvidia GTX970
120GB SSD Samsung 840 Evo for OS
250GB SSD Samsung 850 Evo for programs
2 TB HDD Seagate ST2000VX003 for data
800w Corsair gs 800