I called Apple the other day because I'm having trouble with my screen being tilted to the left and also either my SuperDrive or my hard drive on my iMac is making a funny noise. I think its my hard drive. Anyways after a 20 minute wait on the phone I finally got to talk to an iMac specialist. He was real nice but he never gave me a Case Number! I know they used to, but I never got one. I need to take my iMac to an Authorized Service Center. Will they ask for a case number when I take it in? Is this something I need? What would I do to get one if needed? Thanks!