The only other thing I can think of right now is to get out a magnifying glass and check the adapter.
Maybe a cold solder joint or a damaged trace ?
Seeing as there are no compontents on the adapter, it`s gotta be something simple (the kind of simple that always makes the air turn blue when you`ve found it :pissed: )..I wouldn`t have thought the extra couple of inches on the traces would cause a problem..