Originally Posted by NJBlackBerry
On the first one - the endless gears loop - you do this; hold down the volume down + power + camera
It will reboot and the gears will start - should be less than 5 minutes; if it isn't, do the volume down / power / camera deal again.
It has happened to me twice and this recovered it - thanks to the folks at wpcentral.com
I did the volume down/power combo, and it just went to the same. I didn't know about the camera button addition.