Question about Apple PowerBook G4 Mac Notebook

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My Powerbook G4 screen turned off because it was unplugged and the battery is no good. This has happened before and I remember there was a simple solution (some combination of buttons; Control + Option + Power, or something to that tune)... but can't remember what the combination is now. Can you help?!

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It's called a Power Management Unit (PMU) Reset. Here are Apple's steps:

  1. If the computer is on, turn it off.
  2. 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.
  3. Wait 5 seconds.
  4. Press the Power button to restart the computer.

Posted on Mar 24, 2011

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Common fix for this problem is a simple Power Management Unit (PMU) reset. This will basically re-sync the battery "brain" to the computer so they when when to charge and when to stop. To do this, simply turn your computer off, remove battery and power cord and hold the power button down for 7-15 seconds. Then you MUST wait 15 seconds after pressing the button before applying power or inserting battery. 75% chance this will fix your problem. If Not, Replace Adapter/Charger. They have a microchip in them that can go bad that senses when to send more current to charge battery. Apple motherboards are generally better built so I'm not suspecting that at this moment. Let me know what you find out.

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