I've just synched my iTunes library to my iPhone for the first time since I downloaded iTunes onto a new laptop. Only some of my library has transferred to my iPhone, despite all song boxes being checked. * my iPhone was registered on my old laptop. Since I downloaded iTunes onto my new laptop I've imported my old iTunes library although when I tried to play some files I got an error 'iTunes cannot locate file...' * the songs I checked to transfer to my iPhone all play OK on my laptop in iTunes * only 500mb transferred to my iPhone, my iTunes library is 6gb. Any advice would be much appreciated.