Here's the system:
- i5 4690k overclocked to 4.5ghz
- gigabyte ga-z97x-gaming 5
- hyper 212 evo
- 16 gb ddr3 ram 2133mhz (4x4gb)
- asus strix gtx 970
- Samsung evo 850 250gb ssd
- wd caviar black 1tb hdd
- corsair cx600
I've had this pc for two years and haven't had any issues until now. The problem started two weeks ago. I printed something, and went back 10 minutes later to print something else. The computer was off, which was strange. I turned it on and it began a cycle of appearing to turn on, then restarting every 5 seconds until I turned off the power supply or held the power button for 5 seconds. During this, nothing came up on the monitor. I tested all the ram by putting various single sticks in A1 or B1, tested the power supply with my multimeter. I took out the gpu and tried the motherboard outputs (dvi, hdmi, displayport, vga) and got nothing - the same ~5 second cycle with no video. Based on this info, I sent my motherboard back to gigabyte for repair/replacement (still on warranty till Nov 2018).
I ordered a cheap asus b85m-e micro atx board since I didn't know how long it would take. When I received it, I breadboarded it with just the cpu, cpu fan, psu, and ram. My case doesn't have a speaker, so I bought a buzzer from a local repair shop so I could hear if it's posting. When I turned it on, there was no video, and after 20 seconds the cpu and psu fan turned off for 5 seconds (just enough time to spin down to stopped) then restarted and stayed on - still no video. These results were repeated over a dozen times in various configurations (no ram, 1 stick ram, gpu). During all of this, there were no post beeps. I tested the buzzer I bought with 4.5 volts of batteries and it did work. I brought everything to the repair shop where I bought the buzzer. They breadboarded it there using their psu and ram and got the exact same results. They thought maybe it needed a bios update to support my cpu, but I confirmed with asus tech support that the bios version on the board supported my cpu.
I assumed I got a dead motherboard, so I ordered an ASRock z97 board. I tested it today and got the exact same result as the asus b85m-e.
-max cpu temp was never over 80 when stress testing with prime95 small fft. Vcore max was 1.295 volts
-I always use an anti-static wrist band when working on it.
I have gone through this list with both the asus and ASRock: http://www.tomshardware.com/forum/261145-31-perform-ste...
So, what could be the problem? CPU? That's kinda what I'm down to...