I dont know what happen but this morning i was play on my ipod until i had to go to school. After that , i came home and when to play on it again, but i cant seem to unlock the screen. i tryed shutting it down but i can slide the "slide to power off" I rebooted it, nothing really fixed it. tryed restoreing it. nothing again. how may i fix this problem? i seem to say at the lock screen or i cant even make anything work when i touch it. what should i do.