I had been sending pictures when my ultra turned off and now won't turn o n at all. I'd just paused long enough to talk to my son and then nothing. It was working great before this happened.
Are you sure you did not run out of battery? Try charging it for at least 10 minutes, then try turning it on again. Try different charger to be sure. If it's still the same, I suggest that you take it to an Authorized Motorola service center and have experts check it, problem may be with the battery.