I know there's other threads, but I haven't seen if tightening the screws actually fixes the problem? Mine only creaks when I pick it up in certain spots, but it's still annoying. If I take it to the genius bar, will they tighten them for me? Also can someone link me to the correct screwdriver that's needed? Oh, and if it needs replaced (hope they can just repair it).. Will they do it even if I didn't purchase the computer from an Apple store? I got it from Macmall. I figure the year long AppleCare would take care of that? Thanks!