Droid Stuck on M Logo?

Take the battery out and put it back in. I have the Droid 2 and I have to take the battery out and put it back in all the time. One time it stopped working completely. I just left it on the charger for a couple of days and then it turned on right before I was about to take it to the Verizon Store. You might want to take your phone to Verizon.