Every so often my Mac Mini 1.83 Core Duo w/Super Drive will experience a random increase in fan speed...the fan speed increases from 1500rpm to over 5000rpm for a couple minutes, and then will slowly return to normal. During these fan speed-bursts there is no increase/abnormal temperatures. CPU and Ambient temps could be at 40C. System load is also minimal (95% idle, eg). Haven't heard of this as a common problem, but is this fan behavior indicative of any type of problem? Thanks for any help!