Alright, so here's the breakdown, I tried to take off the back cover of my iMac last night to dust out the fans and everything on the inside, but after taking out all 4 screws (even the extra 2 in the middle) I couldn't get the darn thing off! I used to own a PPC iMac G5 and used to do this frequently and had no problem, the back generally came off by just pulling out and down...... The one I tried to clean out now is a refurbished Intel Core Duo 20" iMac........ I was wondering maybe if it had anything to do with it being refurbished that I couldn't get it off? I was tugging, pulling, and going to the extent where I wanted to break it. But to my frustration, I stopped, put the screws in, and decided to come on here and ask.......... sooooooo....... Is there some special technique of getting it off that I'm unaware of?