Now and then my PC (about 4 years old now) fails to boot normally. More specifically, I press the power button, and the CPU fan, system fan 2 (system fan 1 stays off) and motherboard/GPU lights turn on. But then, nothing. It doesn't even get to BIOS.
After squiggling around with hardware, reseating GPU and RAM, resetting CMOS, and draining power (unplug power cable, hold power button for 30s), now and then it will boot again. But sometimes it initially only starts the CPU fan+mobo lights, and after a few seconds, (or sometimes minutes) it boots normally.
My Specs are:
Windows 10
Intel I7 4790K (not overclocked) + NZXT X62
Gigabyte GA-Z97X-Gaming 5
Corsair Vengeance DDR3 2x8GB @ 1.6 GHz
MSI GTX 1080TI
Corsair RM750 PSU
About 3 months ago I replaced the CPU cooler and the GPU to what I have listed, after which the problem seemed to have disappeared.
Until a few weeks ago. After the unplug+hold 30s trick, the PC didn't get any power, so no CPU fan either. It did however get power when I would reset the CMOS by connecting the plug on the mobo. After the usual reseating and squiggling, the PC turned on (so with only CPU and mobo lights) and after about 15 minutes it booted again.
And yesterday during a game, the PC simply switched off out of nowhere, it went for a reboot, and got stuck again without booting into BIOS. I've checked for disconnected components, reseated the RAM (also in different slots), but I get nothing yet.
I'm not sure how to troubleshoot this, and every time it happens I'm afraid it won't boot anymore at all. So any help would be appreciated!