Is there some trick to turning a cube on? I've tried 3 different PSUs, and each one starts and then shuts off after a couple seconds. I've seen other people say it's some kind of under or overcharge, and it can be solved with jamming some capacitors into the PSU, but I have no idea how to do that (and my local Radio Shack doesn't even have 1000+ uF 12v caps).

I've tried:

Visiontek 500W (it exploded and is ruined)
Antec 550W
Corsair 850W

All three of them just shut off after a couple seconds. Is there anything else I can try before buying another PSU? I'm kind of tired of buying new PSUs for this thing.