My iphone 4 says connect to itunes and I can't get out of it?

So I unlocked my Iphone 4 for tmobile and I was using it today but then I tried to Backup and Restore it.
After it shows the itunes icon and says to plug it in to my computer. But when I plug it in it doesn't even show that my iphone is plugged into the computer or itunes. I restored and EVERYTHING. I don't know what else to do. I need to get passed the connect to itunes part so I can access my phone. THANK YOU So MUCH

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