My ipod won't play any sound or play the videos I have on it. Everything looks normal menu wise but when I push play either a song looks like its playing and doesn't have any sound or when I play a video nothing shows up at all - just a black screen. At first I thought my headphone jack was broken because I tried multiple headphones and no luck, but then I'd at least SEE my videos. Does anyone know what's wrong? I reset and restored the ipod but no luck.