Ok, I tried plugging in the PSU to my old computer, and it correctly started 
humming and could be turned on and off with that computer's ON-switch. It 
also made some beeping. PSU fault ruled out.

Back to problem computer I wanted to test if the On-switch was at fault. 
There was a cable labeled M/BSW that was plugged into some pins labeled 
PWRSW so I guess that's the On-switch one. I tried unplugging that cable and 
replacing it with a jumper while the power was off. That I turned the power 
on and ... nothing happened.

So what does that mean? Can I be completely sure that the motherboard is the 
fault, or...?

Rune

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