Pc Died Upon Rebooting

I rebooted my pc ( in system specs) but it did not restart properly. It got past shutting down then went to a black screen, fans on box were still running tho. So i tried holding down the power button for 10 seconds but it still stayed on. The only way i could turn it off from then was to flick the power switch. Now my pc will not turn on at all. No lights no fans no movement at all when i try to turn it on. I have taken the psu motherboard ram and cpu out and put onto a carboard box. I tried to boot it with just those peices in and nothing happend. I then tried just the mobo, cpu and psu. Still nothing

Im compleatly lost, im assuming somthing blewup when it was rebooting, i cant smell anything bad and there dosnt seem to be any physical dmg. No leaking caps or any bad wires. Going to try a nother psu in it somtime today, have you guys got any other ideas, also speculate what might have killled it?

I had put everthing bad to stock frequencys and voltage for the last week due to it getting hotter then i would like. Cpu was hitting 65s and nb was doing 60s, 45cpu and 50nb on stock.

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