USB connection of iPhone 4 to mac

Hi
I recently connected my iP4 to my mac with the usb. It now 'pings' and wont let me connect to the laptop. The 'trust this computer' notification flashes briefly but not enough to make an option. I have reset the phone to factory settings and it still does it. I have tried another laptop and the same thing.
Any suggestions welcome

Hello dwfroscoe
Pick one of the articles below to troubleshoot issues with your iPhone not being recognized on your computer. Make sure that you have the latest version of iTunes installed.
iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/ts1538
iOS: Device not recognized in iTunes for Mac OS X
http://support.apple.com/kb/ts1591
Regards,
-Norm G.

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