frozen iPad
My iPad is frozen and will not respond to anything I do.
There is a message on my screen that states, "iPad Not Backed Up. This iPad hasn't been backed up. Backups happen when this iPad is plugged in, locked, and connected to Wi-Fi. OK"
If I press OK nothing happens. I cannot get rid of that message and it will not respond to anything I try. I cannot even power off except for closing the magnetic cover. My Wi-Fi appears to be working fine on my laptop. I've had it plugged in all day. I am not sure what it means to be locked. What can I do to get my iPad working again?
iPad 2, iOS 5.0.1