Can resetting the Power Manager too many times cause problems with my Powerbook?

Question

I have a Powerbook G4 that has been giving me trouble with turning on so I've had to reset the Power Management Unit (PMU) quite a few times by pressing shift-control-option-power. It works, but it is the only way I can get it to come on now and it will turn off even when sleeping. Is there a way I can resolve this? Does the resetting it too many times lead to other problems like this? Can the PMU be replaced?

I've been thinking about replacing both the external and internal battery, but not if it will be a waste of money. Has anyone else had this issue after resetting the PMU??????

Answer 1

Hi. I'm not experienced with the G4 but I'll give a few guesses. The batteries in a notebook (main power and motherboard CMOS) do wear out. The main battery usually fails first but slowly. It will hold less and less of a charge as time (and cycles of use) mount up. This failure mode sounds like it could be starting because once the voltage drops below a certain threshold, even if the machine is in sleep mode, will cause a shutdown. I would check this first. Good luck!

Answer 2

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