Ibook G4 overheating: not because of the battery, so why?

Hi everybody,
I left my iBook G4 last night on my desk: it was shut down and NOT connected to the power supply, but with its battery in and charged. I found it some 12 hours later very hot and not starting at all (no chime, nothing). I checked it was not already running with a dark screen and it was not. They were no peripherical device connected. I took off the battery: il was cold. The main areas where the iBook overheated during the night were the hard disk (despite the fact it was not spinning) and below the display, in that area where the Airport Extreme Card is installed.
I removed the Airport Card and checked below (Suppl. RAM slot) for signs and smell of something burned. There was none to be found.
Once cooled down to room temperature, the iBook resumed services just as if nothing had happened.
Any clue on what could have happened or hints to what I should be aware of?
Thanks,
Fred
PS: my iBook was eligible to the battery replacement programm and I did replace the battery. I checked again today, and the correct one is in. And, again, the battery temperature was normal, while the frame was very hot.
Message was edited by: Fred Freed

I have an iBook 1.33 taken apart here for resoldering. I found one of the two bolts that hold the heat sink to the CPU had broken loose.
Also check to see if your vent grill is clear and freeflowing.
You should feel heat coming from there.
Richard

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