as far as i know from talks with apple, there is and excuse the spelling, an authincation chip in the actual apple cable. i tried a pac ic-av2 on my home tv to get video out and didnt work. used the appl cable with my 32g touch and got a video signal. im tellin you it something in the cable. if all else fails apple is great on returns so if it dosent work you have nothing to really loose excep some time. i will test it on a 90bt when i do an install later today.