I phone is not recognized by computer

My iphone charges in car and on charger, but when I connect it to the computer it is not recognized at all. I have reset my phone, uninstalled my itunes and reinstalled it, updated all software, tried every cord in the house, tried new and old mac and nothing works. Help.

If you uninstalled and reinstalled iTunes, did you follow the steps in this support document http://support.apple.com/kb/HT1923 exactly. Check and make sure.  If you did, then try this support document to get the phone into the Recovery mode. It may take more than one try. http://support.apple.com/kb/HT1808

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