Thanks to my friend Terry, I was able to get a new (well, used) PSU to try out in the dead computer. Lo and behold, the computer started working properly, and there was much rejoicing. However, it was not to last. Several hours later, the computer just up and died, again, without any known cause.
Submitted by Chris Charabaruk on Tue, 11/09/2007 - 14:54.