i have ICBM 1 touch 6.5 touch screen dvd player.i connected blue wire with ground and i got picture,but my problem is i dont have sound.when i change source on fm,i have sound,but when i swith on dvd is no sound just picture.i have another blue wire and green wire.they are not connected.all that i conected with scotche GM11 for chevy trailblazer.. please tell me what is wrong.Thank you all!