Sometimes a Book will not start if the battery is totally drained. Try removing the battery and disconnecting the AC power supply. Press the start button and hold for five seconds. Insert the AC adapter and see if it will start. If it does that isolates the power problem. If it starts check the battery connector for corrosion and connection to the logic board.
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Sometimes a Book will not start if the battery is totally drained. Try removing the battery and disconnecting the AC power supply. Press the start button and hold for five seconds. Insert the AC adapter and see if it will start. If it does that isolates the power problem. If it starts check the battery connector for corrosion and connection to the logic board. Here's the part: http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-17-Inch-Battery-Connector/IF155-027
Sometimes a Book will not start if the battery is totally drained. Try removing the battery and disconnecting the AC power supply. Press the start button and hold for five seconds. Insert the AC adapter and see if it will start. If it does that isolates the power problem. If it starts check the battery connector for corrosion and connection to the logic board.