From: William Graves on
http://www.pcguide.com/ref/power/sup/parts_Motherboard.htm
short the Power On pin to ground.
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Bill Graves RKBA!
bgraves(a)ix.netcom.com

"Dylan C" <nospam(a)nospam.com> wrote in message
news:12rum7i7gmrej4a(a)corp.supernews.com...
> Lets say I was building some sort of electronic device and I wanted to
> power it with an old PC power supply. What would I have to do to
> 'emulate' the PC power button to turn the thing on?
>
> -Dylan C