| I'm guessing that you need a replacement PMU battery. It can't be the power supply if it's actually booting up into OS 9. See about getting a replacement battery from an Apple reseller.
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• Apple iMac G5 17" (2 GHz G5) - Mac OS X 10.4.11
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• Apple PowerBook Duo 230 (33 MHz MC68030) - System 7.1
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