My iBook does not turn on.
Twice I had problems turning on my iBook. I had to hold the on/off button for a minute or so before it started up.
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Try a PMU reset:
1- If the computer is on, turn it off.
2- Disconnect the AC Adapter and remove the computer's battery.
3- Press and hold down the power button for 5 seconds and then release the button.
4- Reconnect the battery and AC Adapter.
5- Press the Power button to restart the computer.
(from Apple web site) Resetting PowerBook and iBook Power Management Unit (PMU)
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