jastrckl is correct ...
By shorting the green (pwr on) to any black (ground), you will be able to power up an ATX power supply.
The way I did this (to avoid cutting up my main Power Supply) was to install a 12 volt relay in my baybus. By connecting a standard pc molex connector to the relay switch, I can attach that to any lead off of the main PS. I then opened up my second power supply and desodered all the connections (with the exception of the green and a black wire) from the motherboard connector. I then attached a Radio Shack 2-pin connector to the green/black wires coming out of the 2nd PS and the other half to the relay switch.
So, the series of events will proceed as follows.
1. You hit the power button on your pc.
2. Your main ps powers up.
3. The 12 volts on the main ps closes the relay switch (which shorts the grn/blk on the 2nd PS).
4. The second PS starts up.
If I'm not mistaken, they have a nice write up at virtualhideout.net on how to do this. Unfortunately, I have been unable to connect to them for the last 2 days to verify.
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