Ironically my 400 watt power supply burned out yesterday (literally... with smoke !
)
Luckily, I just happen to have a PC junkyard in my basement and I found another identical 400 watter ! All I had to do was pop the power supply open and vaccume out all the spiders, webs and dust that it had gotten from being in the basement.
Those are some MEAN, SCARRY looking capacitors on those power supply circut boards ! I bet they could give you a good jolt even with the power off.