Wow congrats guys...focusing way off at the problem at hand....feel proud.
Drew, assuming you return, technically that PSU should be more than adequate. I've seen people power more drives with a 15a +12v rail....it could be though that the PSU is just crap and not delivering the appropriate voltage, of course it would require a multimeter to check the +12v line for precision.
Thermaltake 560w is what I have, 22a on the +12v rail and I've had ridiculous number of fans, drives, and overclocked CPU, and all kinds of crap on it, rails never faultered.. costs $100