One evening I'm on my PC that has been working for 6 months flipping through tabs in chrome and randomly the PC aggressively shuts down. I spend the next few hours powering down and up, plugging and unplugging the power cable, changing wall outlets, etc. Finally I leave the PC unplugged to go take a shower, I come back, plug in the power cable, and the PC powers on as normal. I'm checking things and everything seems to be normal. Restarting the PC didn't have any affect, but when I completely shutdown the PC it wouldn't ever boot up again. The only things that the PC will do is: the graphics card's LED's and fans turn on, all the case fans turn on, the NZXT Kraken X61 fans turn on, the LED's on my Corsair RAM turn on, the red CPU LED is on, the power and reset LED's are on, and the Q-code 00 is displayed. I've completely dissembled the PC and trying to diagnose the problem to no avail. Flashed the BIOS with the latest BIOS update and that didn't fix the problem. Tried running the PC with nothing but the AIO water cooler, PSU, and CPU with no success. Took out the CPU, examined the motherboard CPU socket to find any bent pins and there weren't any, put the CPU back in, put the AIO water cooler back on and still no success. I do not have any spare "known good" parts to try. I'll list my specs below if that helps. Thank you
Update: Couple weeks later the PC is now booting up as normal, but it will shut down immediately at random times while I try to use it. I managed to run the ASUS PC Diagnostics utility before the PC would shutdown and memory under stress test says internal error.
Update #2: The PC does not shutdown randomly anymore. I ran MemTest86 V7.3 and there were no errors. I also ran Prime95 for 24 hours straight with the CPU at 100% load and the RAM at 90% load. Prime95 never caused the PC to shutdown and didn't show any errors.
OS: Windows 10 Education 64-bit
CPU: Intel Core i7-6800K Broadwell-E
Mobo: ASUS X99-A II
Graphics Card: EVGA GeForce GTX 1070 FTW
PSU: EVGA SuperNOVA 850 P2
RAM: CORSAIR Vengeance LED 32GB (4 x 8GB) 3000MHz
SSD: SAMSUNG 850 EVO 500GB
HDD: WD Black 2TB 7200 RPM
PC Case: Fractal Design Define S
AIO Water Cooler: NZXT Kraken X61
Update: Couple weeks later the PC is now booting up as normal, but it will shut down immediately at random times while I try to use it. I managed to run the ASUS PC Diagnostics utility before the PC would shutdown and memory under stress test says internal error.
Update #2: The PC does not shutdown randomly anymore. I ran MemTest86 V7.3 and there were no errors. I also ran Prime95 for 24 hours straight with the CPU at 100% load and the RAM at 90% load. Prime95 never caused the PC to shutdown and didn't show any errors.
OS: Windows 10 Education 64-bit
CPU: Intel Core i7-6800K Broadwell-E
Mobo: ASUS X99-A II
Graphics Card: EVGA GeForce GTX 1070 FTW
PSU: EVGA SuperNOVA 850 P2
RAM: CORSAIR Vengeance LED 32GB (4 x 8GB) 3000MHz
SSD: SAMSUNG 850 EVO 500GB
HDD: WD Black 2TB 7200 RPM
PC Case: Fractal Design Define S
AIO Water Cooler: NZXT Kraken X61