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Originally Posted by mastermind2004
IIRC, the powersupply is designed to provide power, so long as the PS_ON (usually pin 11?) is grounded. If the voltage is high, it has to cut out. You'd probably need a way to take it off of ground. I could be pretty off base though, as I was only looking into a way to activate a PSU without the motherboard.
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Here's a good link on something that would work pretty well. A delayed signal that would allow time for a shutdown via something like Shutdown Now, and if there is a crash and the computer can't shutdown, it would hard power down the comptuer.
http://linuxcar.sone.jp/pic.en.html