ok so I have been thinking about this for awhile for my old comp. I have a feww HDD's laying around and another PSU. I have a 200watt PSU and a few hdd's including one 250 gig that will blow either of my computers because I'm already pushing it. My question is how do I set up a second PSU so it will turn on when the other does? Do I have to add wires to the mobo connector? add another switch? what?