Dead IIgs- possible causes?

[Michael Elliott <zonie@geocities.com>]

I have a dead Rom 01 IIgs...I have a good idea what the problem is, but
thought I would ask any GS gurus out there for ideas...

Here's what happened- after successfully reloading the Focus Hard Card
on this machine, it restarted and operated exactly once.
Then, after being turned off for 15 minutes, I now get nothing- no beep-
no light, nothing.
Is this obviously a bad power supply? or is there something on the
motherboard that would possibly cause this kind of catastophic failure?
I get no LED's, and no power to the interal fan plugged into the
motherboard. Unfortunately, I don't have a meter or I'd test the PS
myself. 
I'm fairly certain I just need to drop in a new PS, but thought I'd
check to see if there wasn't some odd thing that occasionally causes
this problem on GS's.
Thanks,
Michael
zonie@geocities.com