Question PC boot loop, done troubleshooting.

[mysteriousaeon]

Hi. i7-4790k, G.SKILL RipjawsX 4x4GB DDR3 1600MHz, GTX 1080 here. PSU is Corsair TX750M. I first got the boot loop on a GIGABYTE G.1 Sniper Z97 motherboard. I suspected the problem was a corrupt bios. I took the PC to a repair shop and they also said it was a corrupt bios. It would work when they flash a new rom, but after shutting the PC on and off and on and off again it would get corrupt again and stop working.

This led me to believe the problem was the motherboard. So I got a new one. Second hand from a trusted person. It's a GA-Z97-D3H. I assemble everything, clear CMOS, cables are tight, no problems... And the same thing happens. I press the power button, fans spin for 2 seconds, power shuts off and it loops. Forever.

I suspected the second hand motherboard I got could have an outdated BIOS which would make it not work with my i7-4790k, but the exact same boot loop makes me suspicious...

Could it be my PSU? Before the infinite loops started happening I would shut off the PSU for about 10 seconds, turn it back on and the PC would boot with no problem. In time, this stopped working.

I'm at a loss for what to do. Any input would be appreciated.

 

[mysteriousaeon]

I just tried it with a different PSU. Same results. I'm thinking either the second hand MB doesn't have its bios updated to support my CPU, or my CPU just randomly died. I don't think the bios being outdated is a possibility, because it's the same kind of boot loop like my old motherboard, which worked fine for a very long time.

Did my CPU just randomly decide to die? I can't think of anything else. I tried with no RAM, no GPU, different PSU, different motherboard... Running out of options.