Since updating to 5.1, my phone will not turn off or on.  Black screen with white apple icon.  Any idea how to fix?

I don't know if I have a 4 or 4s. 

The latest version is 5.1.1. If you are trying to update to 5.1 that is your problem; it can't be done.
As your phone is "stuck" follow the steps here: http://support.apple.com/kb/HT1808
It doesn't matter if you have a 4 or 4S, but you can easily check by entering its serial number here: https://selfsolve.apple.com/agreementWarrantyDynamic.do

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