I've read another strand about the problems with the gaps when PowerBooks are closed, but does anybody know how to fix the clasp when it stops working? The hook still comes down and "hooks," but as soon as I let go of it, the top pops back open. It's been getting progressively worse over the past three weeks or so, but now it won't stay closed at all. It's not a big deal when I power the thing down, but I can't just close it and put it to sleep now. Any ideas? (Especially one's that don't break the bank!) 