Earlier this morning I received an update for my ICS OS on my Nexus. I read what it was going to do and deiced to go ahead and let it upgrade. It's been about an hour now, the phone is still off, and I can't turn it on. I am hesitant to remove the battery since maybe, just maybe, it's still doing work. However, there are no signs of outer life other than the phone has been getting warmer to the touch, not hot at all but warm. Any advice?