My 17" Powerbook has developed a nasty habit of occasionally locking up. I usually just ignore it, but since it happened twice in 2 days, I thought I'd post. The mouse and caps-lock keys still work. It seems like I always run iTunes during this time I may also have been running Word both times It usually runs between 125º and 129º. The most recent lockup was 125º I never reboot. I have probably asked it to shut down like 5 times in 9 months. The system logs are predictably empty. MenuMeters always shows that the harddrive is "reading". Thinking this may be hardware related, I have a MX900 mouse and a SprintPCS Merlin card. Advise?