Thanks, Franklinstein. I cleaned out the innards and tightened the screws. Everything seems fine now. It was very strange when it was happening, though. I always have Activity Monitor open and the processor always seemed to be spiking, even with no programs open. Unfortunately, Word 2003 seems to be spiking the processor with documents over 150 pages. I downloaded istatpro, which reports CPU temps around 120F. I think the hot and humid summer air was causing the unusual temperatures. I never had any crashes, but boy did the PowerBook get hot.