Is your mac pro dusty inside or very clean? How often do you clean it and what method have you use? I open mine and was shocked to see how dusty it is. My ATI Card that I replace with an aftermarket fan now collecting a lot of dust inside. How do I safely clean all the dusk out? I was going to use an Air blower to blow it out, but I'm scare it may damage my Mac Pro because it's too powerful. Should I just buy the Air Blow Bottle at CompUSA?