Charles Schuler wrote:
Twice a day or once a month or whatever, this computer goes dead. The LCD
monitor goes black and the keyboard becomes non-responsive (Caps Lock does
not light the LED). The USB ports also seem to go dead as
disconnecting/reconnecting them does not produce the audio bong. The fans
are running and the LED on the mother board is lit.

Pressing and holding the front panel power switch will shut it down and then
pressing it again will power it back up and it ALWAYS boots normally.

Have tried:

1/dismounting all the boards and reseating them (including RAM)
2/dismounting the processor and reseating it
3/cleaning out the dust bunnies
4/reseating all the connectors
5/pushing and tapping all over the place when it is normal trying to force
it to fail but that never happens.

Any ideas?

Sounds like a bad power supply. One or more sections are shutting
down. Replace it before something gets permanently fried.