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Warning: Resetting the Power Manager on any PowerBook or iBook will permanently remove a RAM disk, if present, and all of its contents.
If the computer is on, turn it off.
Disconnect the AC power adapter.
Remove the battery.
Press and release the reset button (shown here) located above the Audio/Video port on the left side of the iBook (Dual USB) computer by inserting the end of a paper clip into the small hole and gently pressing the switch once.
Wait 5 seconds.
Reconnect the AC power adapter.
Put the battery back in the computer.
Press the Power button to restart the iBook computer.
Got the same problem with my ibook G4. I have research on how to fix it, and found out that most model of G4 has the same problem. I soon found out the main problem and the solution, it would require some skill in soldering and dis assembling the whole laptop. Go to this site and hope it will help you just it like it helps me a lot!
You have a firmware problem and it needs to be reset.
try this first:
If the computer is on, turn it off. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-Power on the keyboard. Do not press the fn (Function) key while using this combination of keystrokes. Wait 5 seconds. Press the Power button to restart the iBook computer.
If that doesn't work, try this:
Turn the laptop off.
Remove the battery but leave the mains power attached.
Hold the start button down until you hear a loud beeeeep! then release.
Wait for the system to reboot and hopefully thats you sorted.
There are several models of iBook G4. The following sequence applies to the "14-inch Early 2004."
Remove all peripheral cables. Remove the battery. Reset the power manager by pressing the key combination Control-Option-Shift- power. Then plug the iBook into AC power and attempt to start it with the power key.
If this procedure does not being it back, invasive diagnostics are required, in which case you should being it to an Apple-Certified tech for repair.