I'm stuck in itunes mode when update ios to 6.1 from ipad2

I see ther update and update to ios 6.1. Something happened that make the ipad now stuck in itunes mode. I connect power to charge and see if it can go any further but it is failed and did not go any further. I tried to power off + home button but nothing seems to work. What should I do to get the ipad work normally? Thanks.