Install problem, black screen

I hit the button to install an update on my Iphone 4s.  Now my screen is black and all I see is a picture of a charger and the ITunes logo.  Cannot get past it.  Shut off phone and turn it back on and screen stays the same.  Any ideas on how to get past this?

Your iPhone is in Recovery mode, perhaps because of a failure to update your phone. Can you connect it to a computer running iTunes that the phone trusts?

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