I have had problems ever since I downloaded the 10.3.3 thing. Now, tonight, the mobile is not working at all. I tried holding down the button on top, but nothing happens. Plugged it into the computer, but nothing pops up---usually iTunes pops up. What do you think is wrong?? Never has been totally dead like this before. Maybe just a battery??? Will not be able to get it to a shop for days at least. Is there something I can try?? Thanks.