I posted a thread about this on www.resetera.com and one of the users their kindly directed me to this site.
My build is:
MSI Z97 PC mate mother board
2X 4gb DDR3 Gskill Sniper
EVGA GTX 980 SC
i5-4690k, usually overclocked to 4.3 ghz, currently at stock value
corsair cx750 power supply
Samsung EVO 850 500GB SSD boot drive (cloned an HDD to this drive a few weeks ago, swapped them and reformatted the HDD to use as my E drive)
EDIT: Forgot to mention I'm on Windows 10
I bought this custom PC used off of Craigslist in 2016. I've never had any problems with it, I've also never re-installed windows. It didn't come with a disk, so I'm guessing I would have to buy a new copy if I wanted to do so? For all I know it could be an illegitimate version on here, I'm not even sure how to check.
It all started with the game Assasin's Creed Origins a few days ago, although I'm not sure if that was the culprit or a coincidence. My PC screen went black and the computer rebooted on it's own. I didn't realize at first that maybe I WAS getting BSOD, you see I have my gpu plugged into my TV, and I run audio out from the motherboard to the receiver for audio. The last time this happened, I switched the inputs on my TV to check the "second monitor" and there was a frozen BSOD with a Kernal Security Check Failure error, I had to manually turn off the PC. I assumed it was maybe game related, but since the first crash I've gotten similar crashes with no BSOD while browsing, on the desktop right after boot, and while watching videos. In all of these cases the image on the screen freezes, if there is sound playing it will also play a distorted loop of the last few microseconds of whatever was playing, before either rebooting itself or needing to be powered off manually. On one or two occasions, once rebooted the system starts up LEDS and case fans and then shuts off immediately 3 or 4 times before booting.
I've since done a system restore multiple times after multiple crashes and don't have any crash dumps, but before I last restored I ran WhoCrashed a few times, and got different results each time. Usually these results included ntsokrnl.exe or ntkrnlmp.exe or HAL.DLL and then a different combination of other things, such as DRIVER IRQL NOT LESS OR EQUAL or ATTEMPTED TO WRITE TO READ ONLY MEMORY. I don't currently have any crash dumps, as I have since done a system restore and have not experienced any crashes since.
I have been able to replicate crashes in Assasin's Creed Origins by changing a graphical setting that requires restarting the game. At this point it asks if you'd like to restart the game to apply the changes. If I click yes the game will restart and the computer will crash. I was also able to reproduce multiple crashes on the OVERWATCH title screen, after idling for 5 minutes or so. I played the game itself for about 20 minutes without issue however. I have since uninstalled Assasin's Creed seeing if maybe the application was causing some errors. I could reinstall it to see if I can reproduce crashes, but it is a 50gb download so it will take a while.
All of my temperatures are fine, although when I run CPUID, under Motherboard Voltages the value for VIN7 is constantly changing and varies drastically, from as low as .140 V, to 1.016 I'm not quite sure what this means and google is no help.
I have tried system restores, updating and rolling back video drivers, updating drivers with MSI update, ran CHKDSK twice, and the windows memory diagnostic.
Yesterday was the first day I had 0 crashes. I have ram in slots 2 and 4. I pulled the ram from slot 4 and booted. I let overwatch idle at the title screen, which consistently caused crashes before. All was good there. I thought "no way I'm this lucky and it's just the first stick of ram I pulled?" Turns out I wasn't that lucky. I reinserted the stick into slot 4, and the PC fans and LEDS would start up for second and then power off, it would do this infinitely until I held the power button or switched off the PSU. I still thought maybe the ram in slot 4 was causing this, so I pulled it out again. The PC fans and LEDS continued to start up for a second and power off. I pulled the RAM from slot 2 and reinserted it, and this let my PC boot. Maybe I bumped slot 2 when reinserting the ram into slot 4 or something? That's the only thing I can think of.
So here I am now. I have 1 stick of ram in slot 2 and haven't had a crash yet. I ran memcheck86 on this stick of ram and completed 8 passes with no errors. I guess what I need to do next is run memcheck86 on the other stick of ram, but I'm kind of scared to mess with the ram again in the event that it makes my PC unable to boot, so if anyone can offer advice on that I'd appreciate it.
Sorry for the long winded post, I've been learning as I go and most of this is new to me. The folks on resetera walked me through my trouble shooting up until this point, but they directed me to this forum after my ram switching boot issues. Any help or insight is VERY appreciated, this has been an absolute nightmare for me, I use my PC for everything.
Edited by Mazzbags, 12 February 2018 - 04:51 PM.