I've just updated my os to 5.1 and iTunes no longer sees my iPhone 4

I've tried all the diagnostics on the support pages. All I'm seeing on the iPhone screen is the USB lead and the iTunes icon. My iPod is syncing perfectly with iTunes but not my iPhone very frustrating. Any suggestions. I've even tried changing usb ports but all I seem to get is a composite device (not even a camera).

try this
for windows: http://support.apple.com/kb/TS1538
for mac: http://support.apple.com/kb/TS1591

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