Hi-new to itouch-i have 16gb-i had a lot of music and games plus i had a passcode to get into my itouch. I used it tuesday and the battery was low-so the blinking star came on and it shut off-when i turned it back on-EVERYTHING was gone-it was back to factory settings. What did I do? Could it have been hacked. Also, I registered it-would they be able to verify my serial number? How can i restore it back?