IPhone "Unknown Device" issue

I picked up my iPhone 4 this afternoon and it had gone to a white screen and seemed stuck there.  It would not shut down.  It would not come back to life.  I did a cold reset and then connected to iTunes to restore my saved setup.  When I power up the iPhone, I get the usual new phone sequence up to and past the point at which I identify the wi-fi network to which I want to connect.  Then the train jumps the tracks.  The on-screen message in iTunes is "Unknown Device."  The phone displays an error message, although now I cannot recall exactly what it says.  You pros got any recommendations on this?

Old TV Guy wrote:
I picked up my iPhone 4 this afternoon ...
Return it.

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