I'm pretty sure I posed this question to the list a while back, but here goes... Looking at the bottom of a Ti PB G4, where the battery fits in, you have a plastic ring that acts like a grommet for the battery. This plastic ring is actually a large plastic rectangle that goes around the perimeter of the bottom metal casing. Well, it started to separate from the bottom casing a few weeks back Solution: I purchased some 5 minute epoxy that would handle plastics and metal (although I think the ring is actually some sort of composite), mixed it up, epoxey'd the surfaces together, and bingo - a 5.00 repair for an expensive part. Posting this as my machine is 3+ years old, and figure there have to be others here who have had this problem, as I baby my PB. John