I have an older Powerbook with an issue I'd like to resolve before I sell it. I'm looking for some expert advice since this seems to be a problem that even the Mac Gurus at the mac store can't help with. The problem is with the power connector. I've replaced the ac adaptor about 5 times now. Each time I do, the new adaptor works fine for about a month, then it starts acting flakey. By flakey I mean I have to rotate the connector to find the "sweet spot" where it will glow and indicate that it's charging. I thought the problem might be at the motherboard, but each time I take it to the Apple Store, they assure me it's the adaptor and replace it. The new adaptor always works fine for some time, then the same problem occurs. The only other factor is that the case near the ac plug has been dented due to a prior drop, but would that defect cause these brand new ac adaptors to burn out? I don't get it. I welcome any help from the mac community! I'm about to throw this thing out a window.