Why won't my PowerBook or iBook power up?

In some cases a PowerBook or iBook won't power up when you press the power button. Typically, when this happens either the Power Manager is corrupt, or the battery is depleted and the computer is not properly connected to an AC power source. For information about fixing this problem, refer to the following article in the Apple Knowledge Base:

For more information about how to most effectively use your portable computer's battery, see the following Apple web page:

Also see:

• How do I get information about the Serious Macintosh Users Group (SMUG)?
• Is there a potential danger with Mac PowerBook 140/170 batteries?