PB G4 went to sleep but now won't start up or force shut down...

My sister has an old PB G4 that has had many previous problems( http://discussions.apple.com/thread.jspa?threadID=2166443&tstart=0 and http://discussions.apple.com/thread.jspa?threadID=2051813&tstart=0 ) but since this morning it has been asleep but we can't get it to wake up.
The sleep light is on and the screen is black but nothing will wake it up. I also tried force shutting it down and nothing happens.
I am leaving it unplugged overnight to drain the battery to see if it will start up then, but I don't know if that will help. I would try to take out the battery but I am not sure if that is safe, as the computer is not really off...
Anyone have any suggestions on what I should do?

Sounds very similar to what my 2003 PowerBook does. I my case I believe it is the combination of a bad main battery and a weak/dead internal backup battery.
Sometimes you can perk up a weak internal battery by plugging into the A/C adaptor and removing the main battery. Leave the computer off for 24-48 hours. In that condition, most of the power coming through the adaptor can be focused on the internal backup battery. This helped mine overcome subsequent occurrences like you describe.
For now, I think you'll have to pull the main battery to progress. Yes, unsaved work will be lost but I don't think you have another option.
When you get it running, use System Profiler to look at the "Power" section and see if the A/C adaptor is the right one. A 17" PB should have a 65W power supply; the 15" uses a 45W version. That is part of my problem; when a friend gave me his PB17, he couldn't find the original adaptor and shipped the less powerful 45W version from a 15" PB.

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