What would cause my MacBook to kill AC power adapters?
I have a black MacBook Core 2 Duo Penryn, and it seems to be killing AC adapters. The adapter will work fine for awhile, but eventually it'll stop charging the computer. Once this happens, if I plug it into another MacBook, it won't charge that one either. If I leave the adapter unplugged for an hour or so, sometimes it'll start working again. Sometimes I have to wait longer. Eventually, though, the adapter stops working at all.
This same behavior started happening about a year ago, and I took it to an Apple store. They replaced the DC-in board, and that fixed the issue for awhile, but now it appears to be happening again. Any ideas?