http://docs.info.apple.com/article.html?artnum=14449#faq4

Try resetting the pmu before you abandon hope. Unplug the book, remove the battery and press the little recessed button next to the power switch. Try it a few times, also try holding that little button down for like 30 seconds. Good luck.
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PB G4 15" 1.2ghz - Pismo G3 400 mhz - iBook G3 500 "Jukebox"
"SawSmurf" G4 500 - Quicksilver G4 Dual 1ghz modding...