I got my 20" iMac G5 at a COMPUSA store about 2 months ago. Today, I went to install another 512mb ram module to bring it up to 1gb. After installation, I was screwing the 3 main screws that hold the back cover on. Well, I was in the process of screwing in the middle one, and I heard a snapping noise. Then the screw became loose and would just turn and turn. I could live with 2 of the clips remaining, but it looks like my imac is stuck closed! This is driving me crazy, I'm going to have to bring it in, just to get a screw fixed. I tried and tried, and couldn't even begin to get it back open. I wonder how they'll fix it, it appears from the inside to be part of the main casing, since it isn't attached to the back cover. Any ideas?