I was thinking about having dual PSU units... I don't mean having two combine and double my wattage or anything... I was thinking about building an external housing for the PSU unit, then running the wires all neat into the back of the case... That would power all my HDD's and my cd drives and what not... Does this sound like a good idea? Any suggestions? How could I tell the external PSU to turn on? Would be nice to be able to turn on my HDD's and everything that will be running on that, and then turning on the motherboard and what not.
You could probably do it, but I think it'd be a long process. I've seen Dual PSUs before, but only for doubling the net watt amount. What you seem to want to do wouldn't be very useful, just a bit of experimentation and fun.