Troubleshooting iphone + computer sync issues

my iphone 4s doesn't appear as a device in itunes when plugged into either of my pc's usb. my other apple devices do.  i have followed all of the troubleshooting on the apple site. i have ensured that my usb ports are operating properly.  the apple store confirmed that there are no hardware issues with my phone.  i'm at the end of my rope.  any advice?

Thanks, yes, I have done this but find that syncing is still lithargic and not all items are synced. In particular it is very important that my calander events are propagated and there is often a large lag time between the iphone and computer sync. I'm syncing using the Wi-Fi setup. Comments?

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