2913 Views 1 Reply Latest reply: Dec 1, 2008 12:41 PM by eww
Hi, W. J. Remove the main battery and leave the AC adapter connected for five or six hours. This will recharge the internal backup battery, if it can still take a charge. Recharging it with a drained main battery in place can take up to 48 hours.
After 5-6 hours, try starting up on AC power, still without the main battery in place. If the computer starts up, you can shut it down again and put the main battery back to see whether that can still be charged. If it's been left in a drained state for weeks or months, it's probably permanently dead and will have to be replaced.
If the computer is still unresponsive after five or six hours of trying to charge the backup battery, either that battery is permanently dead, or the Powerbook has some other hardware problem.
If you are able to get the machine started up, you'll need to reset the date & time and some other preferences/settings that are normally maintained in PRAM with power from the backup battery.