Macintouch - Mac OS X Panther (10.3.5): "
I am a service provider and have seen the fan issue on PowerBook 17's and 15's. The solution which worked for me, appears to be as follows: (this worked on my 17 and on a number of other machines) - reset the power manager.
1. If the computer is on, turn it off.
2. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-Power on the keyboard. Do not press the fn (Function) key while using this combination of keystrokes.
3. Wait 5 seconds.
4. Press the Power button to restart the computer.
This seemed to settle down the temperature the unit was running at and the fan does not come on now.(Except when playing a very graphic intensive game)."