my ipod nano 4th generation will plug into itunes and if i push buttons i can hear music, however the whole time the screen is black so its a guessing game. how do i fix this?

my 4th generation ipod nano works but its a guessing game. the screen is totally black even when plugged into my computer. itunes still recognizes it. is the screen broke is it the backlight, any suggestions how to find out or to fix this? oh and ive completely restored the ipod several times. i let someone borrow it and this is how i got it back so i dont know what caused the problem.

Message was edited by: robynd369