OK, I have a G4 and a new used main board. The firmware on it is 4.18 and I need to update it to 4.28 or what ever the latest is. I have formatted one of my hard drives to 9.2.1 so I can do this. However the power button does not work. According to the directions I need to use this button during the process. I have asked several times, where does the power button store the settings? I have used the apple tech bulletin many times to reset the power button to no effect. I ask again, is my power supply the problem? I have tried 3 new batteries as well.
Thanks

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