Hi I think I may have my first real problem with my Alu iMac. I bought some memory and it arrived today. When I tried to open the slot at the bottom (with the single screw) I couldn't get the screw past a certain distance. It looks like it was cross-threaded when the computer was made (computer is 6 months old) and I definately haven't done anything to it. Anyone had any experience with this? Can I get the screw out or will I need to send it off to Apple? I do have grounds for replacement, right? What's the process like with Apple replacements? I'd appreciate any help. Cheers.