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Problems when starting / restarting a PC

Problem solved. For now.:peace:

I removed CPU, RAM's, GPU, drives, degreased their golden pins with 70% alcohol (100% alcohol seems to be illegal in Croatia and is hard to find) and wiped them with clean quality non-Chinese microfibre cloth. Strange thing is that I found a tiny piece of synthetic fibre inside the CPU socket prior to inserting a CPU. Maybe it was there before and maybe it wasn't. Anyways, the problem seems to have gone for now as I have smooth, uninterrupted exit from BIOS and, for now, no more shut down-restart cycles when restarting a PC immediately after stress tests. I hope that the problem is completely gone.

I also degreased pretty much all pins on the motherboard except socket pins, swapped RAM positions (where was the first stick now is the second and vice versa) and I even reseated 24-pin ATX & CPU connectors. What caused the problem? I'm not sure, but it could be that synthetic fibre if it was there.
 
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