I have already done the first part...watching taskman (been keeping it open) and when the fan kicks up (usually lasting 10 seconds or less) and there is no visible spike in CPU usage. I will have to get a thermal sensor from home and bring it in to measure temp, but I would imagine that it would be nominal given what I see in taskman. I am thinking though that the best solution may be to replace the fan with one that is manually adjustable. That does make be somewhat leary though given that I do initiate processor intensive tasks from time to time (namely when I need to convert a video to flv etc). The other thing that occured to me is that maybe this could happen in response to a power spike? Since this is a work machine, we must have our machines attached to a 15 min UPS. I have noticed my mons and lights occasional flicker just for a split sec, but never at the same time as the fan thing. I doubt it but it was a thought...