my ipod wont sync
it was syncing all my music when my friend came in and dissconnected my ipod because we were going to leave the house. while i was out almost 7/8 of my music which was there BEFORE the sync is now grey and wont play when i select it on my ipod. also when i connect it, my computer doesnt pick up on it and the ipod merely charges. now also all of my music is un-playable from my ipod but is fine on my computer.
what do i do???
iPod touch, iOS 6.1.3, 4th generation