There's no peeping, no warnings, no bluescreens whatsoever.
I want to note that once the PC boots, he runs super stable. I can play games, everything. It's not a heating problem because the temperatures are okay.
This only happened today because yesterday before I went to sleep, I switched off the PSU (which I normally never do), so probably had something to do with the ELKOs.
I just switched the PC off, waited, and turned in on, and voila, it worked.
It could be also something to do with the motherboard. I searched a lot and it's probably either PSU ELCO or Motherboard ELCO. Damn, need to figure this out.
Maybe I should open the PC and look for damages, but I'm not smelling a damaged condensator.