I have been having this issue for 2 weeks and I have done everything I can think of and still no progress.
-After playing CS:GO for 1 minute PC shuts off completely, tries to restart, beeps once, fails to start and shuts down again.
-PC fails to turn pc on 3-5 times before it can actually turn on.
-When finally powered on, PC can never load the OS. It will only post a black screen after windows loading logo.
-Only way to get pc to load OS again is to unplug pc, wait 10 seconds, plug in and power on.
I built this pc myself in march 2015 and everything has been working perfectly, up until two weeks ago. When the above issues began to happen. I assumed it was a software issue even though I had not updated or installed any new software, but I did a clean install of Windows 10 hoping to resolve the issue. After the clean install and latest drivers did not resolve my issue, it had to be a hardware issue. I performed the windows Memory Diagnostic Test, Memtest86, Intel Processor Diagnostic Tool, and Passmark Performance Test 9.0. I did an RMA on my CPU, Motherboard and GPU and still nothing.
i7-4790k 4.0 Ghz
ASRock Z97X Killer Mobo
G.Skill TridentX 16GB (2x8GB)
EVGA GTX 980 FTW
Samsumg SSD 850 EVO 250GB
Cooler Master Seidon 120v AIO Liquid Cooler (currently using Intel Stock Cooler, due to CPU overheating with Liquid Cooler)
I have WhoCrashed, but no crash dumps have been generated even after changing the setting to complete memory dump. As mentioned below, PC just shuts off.
While performing the Passmark Performance Test my PC did shut off a couple of times half way through the testing but I had Speccy open at the same time so that I could monitor the temps and CPU and GPU were both at ~65C when it shuts off.
I checked the PSU voltages while in the BIOS and they are well within the acceptable ranges 12.192V and 5.094V.
While playing CS:GO (before it shuts off) I alt+tab between CS:GO and Speccy to check temps (I alt tab due to not having a second monitor) and GPU is ~40C and CPU is ~60C and then PC shuts off.
As I mentioned before, I am completely out of ideas and do not know what else to do. I hope that someone can help me out.