Sounds like a power supply problem to me. I had a comp crash a couple months back because a power supply failed. My advice would be to not use those power supplies anymore, as they may fry anything that gets plugged in to them. That's what happened to me. But I can't see how sticking those drives in another computer would hurt them pr the computer at all. Even if they are dead, you might be able to recover some or most of the info on them with recovery programs.

In short, throw the PS's out. It's not worth the cost of them for the risk of frying anything else.

Sorry about your luck