So you're getting no power at all to the Compaq? Try unplugging the power cable out of the power supply, wait for a few seconds, and insert it back in. Then turn on to see what happens. I know it sounds odd to do this but it fixes some of my problems before. I had the same deal when nothing would come on. I thought, oh crap, my power supply went out or something. I just pulled the cord out and reconnected it 5 seconds later and everything purred to life.
Might be a sign of a weak power supply though. I should get mine replaced and possible your friend may have a similar problem.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?