Iphone 4S connect to Itunes message won't go away?

I was trying to update my IPhone today, and when it was verifying it turned off and went to a screen that says "connect to ITunes" ( using the charger icon and an arrow pointing to ITunes ) and I plugged it into iTunes and it didn't recognize my device at all. It doesn't say "sync" or anything. It just says on the computer "USB is not recognized". I have tried uninstalling it and reinstalling it, tried using 3 different cords with 3 different computers. I plugged my ipod into it to see if it was the computer, and it worked fine. I've tried everything! Please help, its been like this for several hours and I can't use my phone at all as of now.

Take your iPhone to the Apple Store. They will give you the best answers and support for your iPhone 4S.

Update didn't complete or is corrupted so it's stuck.
https://discussions.apple.com/...e/21787283

Put it in DFU mode. Best luck.

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