I used to use an ibook 600 12", and just got a new ibook 900 14". The apple av cable to mirror the screen on a tv won't work with the new ibook. It still works with the old one, so I know the cable didn't go bad or anything like that. Is there anything that would make that cable not work with this new ibook? Are either the 14" models or the new (900mhz) models different in some way from my old ibook that would cause this to happen? thanks.