Power Mac G4 Power-up Problem

Hello folks, I hope someone can help with this one. About once a week I press the power button and nothing happens-the button won't light up and the G4 doesn't boot. I have discovered that if I open and close the side access door, the machine boots normally and works perfectly. I've tried the "force shut down" to reset the SMU but the problem persists. Does anyone know why this is happening and what I can do to fix it? Thank you in advance for your help.

Hello again Tom,
Man, you nailed it! The problem was a bad wire in the harness associated with the power supply. After replacing the battery, (which was 3 years old so I put in a new one as a preventative maintenance measure), and reseting the PMU, the problem was still there.
Not feeling comfortable to go poking around (this was before I got your last email), I took it to a local Mac shop and they found the bad wire. It's just as well, I wouldn't have been comfortable replacing the power supply myself.
Thank you so much for the expert diagnosis, have a super day.
daplunker

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