Powerbook G4 Power problems

I have a 1.67 GHz Powerbook G4. This morning it was fine. When I got home from work, it decided that it suddenly no longer wants to stay on when not plugged in. The battery is showing a full charge. The light on the plug is green. But the second I unplug the cord from the laptop, the entire thing shuts down.

Any suggestions on what it might be? Hopefully nothing crazy expensive to fix.

lamina said:

Shut down the computer, hold down the power button until the light on the front blinks and you hear the fans spin up really high, and you hear a BOOOOOOOOP sound. Don't be alarmed, you're just resetting the PMU.

Click to expand...

Is there something I'm supposed to do beyond this? Because I did it twice and I'm still having the same problem. The battery is reading 98% at a full charge. And I have always been really good about draining the battery and then charging, etc.

Any other suggestions?

Ok, I have done all of this and it still doesn't work.

Also, the date and time, after shutting down, defaults to December 31, 1969.

I read a thread over at http://discussions.apple.com/thread.jspa?threadID=985798&tstart=15

Other people are having the same problem. No one seems to have a solution. What's happening to the woman's powerbook in the first post is exactly what's happening to mine.

Help I'm going to be on a plane next week and without my laptop I'm essentially deadmeat for the entire flight.