I bought my 27" iMac about 2 years ago (it's a C2D). I currently have Apple Care with about 1 year remaining. I have 2 ongoing issues with my machine: 1. I have some yellowing/tinting like many others and thus far have decided not to do anything about it. 2. Something is wrong with the fans. Sometimes when I get home from work the fans are going at full speed even though the computer hasn't been used all day and is cold to the touch. I have to shutdown (not restart) for them to go off. This happens probably once every week or so if the computer is not shutdown. I have been hesitating bring my iMac into a genius bar because it's a real pain to bring it around and I feel like they are going to want to keep my computer for weeks to recreate/fix the issues. Is there any way they will just swap it out for a new one? What should I do?