Dead power supply? OR something else?

[R3v3lation]

I had a lan party last night, and when I finished setting my computer up downstairs it wouldn't turn on. No fans, no lights, nothing.

I finally got it working by swapping out my PSU but when I brought it back upstairs today it wouldn't turn on again, same as before. Now, the one I swapped out before(the one that wasn't working) doesn't seem to work in any of the computers I've tested it in, so it apears to be dead. The "new" PSU that I replaced it with doesn't work in nay computers either, including the one I swapped it from...

I got a new PSU(for the computer I swapped the PSU from) and it's working fine for this(not the one at the lan) computer, but it didn't work at all for the one at the lan. When I tried it it did the same nothing as before, except when I held the power button down I think I heard a crackling sound... like electricity.

I'm thinking this might be a problem with my case... but I don't really know. Does anyone have suggestions? I'm thinking of just going and getting a whole new case and PSU.

[JoT]

I can think of a couple of things; ground fault, breaker/fuse tripped inside the PSU, too much load on the PSU. What kind of PSUs are they?

[lowbaby]

check all the wires going into all the plugs for loose play or broken contacts.
or any bare wires or cuts

[stool]

Try jumpering the PSus like this;
http://www.burningissues.net/how_to/power/images/plug.gif

then plug them in. If they have some life left, this in most cases will get them working again. If nothing happens, there's a pretty good chance they're DOA.