My Ipod Touch started freezing after I pressed the home button, then while I was in an app or on safari it quit unexpectedly either back to the home screen or the page where you unlock the Ipod and it froze. Then it quit and kept on doing it so I just shut it off and was going to turn it back on but it wouldn't work!!!!! I tried to do a hard reset by holding power and home button but didn't work, regular power on didn't work! Then I plugged it in to computer and it said usb device unknown! I tried several techniques and none seemed to work! Anyone have any ideas on what is wrong with my Ipod and how to fix the problem???????? PLEASE HELP!!!!!!!!!!!!!