Allright, now that we are sure you have an AT...
There are three methods for turning on each type of this P/S....
One is an external switch, (Which most already have...90% of AT's)
The external switch should be on a long cord and should also include a grounding wire. Alot of people think that when they flip the switch on the back of the P/S itself that it should come on, but that is not the case. It is just there as a main power shutoff....
If your computer dosent have the long external cord going to a switch, then there are two other options....
One being a propriatery power supply that is brand specific... IBM's HP's etc are especially bad for this... Instead of using an external switch they use two wires to jump to the motherboard, and then from another spot on the motherboard the same pairs jump to the cases' power switch. (Super simple to defeat, just cross the wires and it will come on, or if you want you can simply put a swith inbetween both wires...
Two, is called a "power good" signal. It takes power through a set of wires, and then when it senses that there arent any shorts it drops the voltage... In this case I would look for another power supply, the means to the end isnt worth the trouble... You could head to a local computer store and see if they have any old parts, you dont need one that is top notch, just one that works....
If you have any other questions feel to ask... That or If you can post a pic of the p/s and its connectors that would help to get you going....
Good luck
XS
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