wrote in message
...
\I recently installed a DVD drive into my PC. (2 days ago.) Since then,
I get spontaneous power loss periodically - sometimes seconds after
booting, other times after hours of operation. I've tried replacing
the power supply, and I've tried removing all my hardware (other than
RAM), so I'm thinking it must be motherboard related.

Unplug/replug all power and data connections. That way, the errant loose one
will be fixed and your problem will be resolved.