IPhone 4 no longer recognized by computer after turning off wifi sync

I've been having trouble with my brother's iPhone 4 syncing to our desktop computer. When I realized it was set for wifi sync I turned it off; now the computer won't even recognize the device. I know it's not the usb port because I've pluggen in other devices (GPS and memory sticks) and they all work just fine. The computer makes the sound when something connects when I plug in the iPhone but it doesn't appear anywhere or even register on the phone or the computer that it's plugged in. Can anyone help me out with this?

Did you follow all steps in the article below?
http://support.apple.com/kb/ts1591

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