I opened the RAM port the other day as i seen some dust hanging out of it when i was cleaning my screen and it was full of dust. This is making me wonder how bad inside the computer is. Ive had it 2 years now and i used to clean my PC out every 2 month or so but obviously the iMac is not as accessable as the PC was. What is the best way to clean the dust out? I thought about getting a can of air and spraying it down the vent along the top, i thought i would ask before doing it though. Any help would be much appreciated thanks.