i have that istat pro widget and last night my exhaust fan was running really high 4000rpm-6000rpm. and i was in a quiet room and it was really loud. usually my fans run soooo quietly... the only applications i had running was safari, pages, and airport is on. that was it. usually when i have only those apps open and airport on it will run around 1200-1300rpm. at the moment it's 2150rpm and i have only safari open and airport on. what's going on and how to i make the exhaust fan go lower?