OK, got new motherboard and guess what? Internal compiler error. So, it's not CPU, it's not motherboard. Doesn't seem to be RAM. Can it be power source?
@Mac_CZ "Doesn't seem to be RAM" honestly I would let Memtest run on it for a few hours...
@michal You're right, I'll give it a try.
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@michal You're right, I'll give it a try.