I searched through forums, but nothing I've found has helped me, so here I am. First of all, everything started when I changed my motherboard, computer just started restarting. I though that was the problem, but underclocking cpu and gpu seemed to delay the restart and running games on low graphics helped too. I always recorded temperature of cpu and gpu, cpu was always below 35 C and gpu was always below 60. One thing eventually changed, now when my computer turns off, it doesn't turn back on if I don't unplug the psu and hold the power on button for a few seconds. Any ideas?