I have an old Power Mac G4 here that stopped working recently. It just doesn't start anymore when pressing the power button, not even a light or anything. It just doesn't react to the power button at all.
I have an old Power Mac G4 Digital Audio here that doesn't start anymore. The suspicion fell immediately on the power supply, as that had failed before and was already exchanged once. This time we bought an adapter that allows the use of a standard ATX power supply, but that didn't work as well. Nothing at all happens when pressing the power button, not even the fan of the new power supply starts.
I tried a PMU reset in a few variants, with or without removing the battery. This changed nothing. I also checked the battery itself, and it only provides around 3V, not 3.6V as it should.
- Can the battery alone cause this problem? I would expect battery problems to occur later, and not stop the computer completely from starting.
- Are there any ways to circumvent the power button and give the signal to start up the computer directly?
- Any other ideas on what the exact problem could be, or how I could troubleshoot this further?