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I am working with another member of the forums on a laptop carputer install into his car. We ran into a similar thought. A power switch on a laptop (as on a normal desktop PC) is simply a circuit that is shorted out when the button is pushed. I wanted something that wouldn't break, and would not interfere with the portability of the actual computer incase it had to be removed. I then took a multimeter and ohmed out where the power switch touches the board to discover the fasion in which it shorted. I then discovered the modem port simply had a connector from the port to the interior. Basically I connected each of the contacts of the modem to each side of the power switch with a little bit of spot soldering. So now the machine can be wherever, and to toggle the power all you have to do is plug in a rj11 into the port, then short them out. Bang, long power switch. On a normal motherboard it is a bit easier, look on the manual and you can see which jumper is your power switch, and it is just a matter of running the wire.
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