Well I've just found out that my iPhone won't sync to my Mac through it's USB ports or my displays USB ports, its not the cord I've tried 4-5 and they all work on other iPods, it probably isn't the USB ports so much ether because I have an external HD and another iPod hooked up successfully right now. Would anyone know what is wrong with it? Oh yeah and the iPhone changes through the AC adapter. 😕 Thanks.