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Which Power Adapter is the correct one for Powerbook G4 15inch FW800 - 45watts or 65watts

I have a Powerbook G4 15inch FW800 with a 45watts Apple style power adapter. Recently it would not boot up. I removed the battery and it did. However after a shutdown, later on it did not boot up ...
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PowerBook G4 PMU Reset Required

I have to do a PMU reset to turn on my G4 PowerBook (1.25 GHz). This occurs on every shutdown of the system. What are potential causes of this? I'm perfectly happy to troubleshoot, but on Google ...