Hey My iMac 24" intel makes this very slight buzzing noise when its on. its about a year old, and i am starting to suspect that the fan is getting "buzzy" because of dust or whatnots. How can I check and clean it out? Do I have to bring it into apple store and pay copious amounts of $$$ to basically get some guy to open it up and blow out the dust? I also noticed my temperatures have been steadily climbing over the past 6 months... my HD temp used to run at 40 ish, nowadays it runs closer to 60... Any ideas / suggestions would be greatly appreciated. Thanks.