I had the same probleme as you except there was no power surge... i simply powered of my pc with the psu switch and then nothing!
After going through about the same diagnosis steps as you i got to the same conclusion... bad mobo...
I had the same probleme as you except there was no power surge... i simply powered of my pc with the psu switch and then nothing!
After going through about the same diagnosis steps as you i got to the same conclusion... bad mobo...