Hi guys, I've had my Powerbook for 2.5 years now. This summer, I've noticed that the fan keeps turning on and that my laptop overheats way too often. Today, I went to the store and bought a Targus Chill Mat. Now, it doesn't overheat. BUT, I have a feeling that I have some dust collected in the fans. I would feel a lot better knowing that my fans are clean. Anyways, how do you guys go about this issue? Do you open it up and wipe the dust out? And how do you clean the fan? OR should I just leave it as it is and stick with the Targus Chill Mat?