Iphone is no longer detected on itunes/computer it is synched with.

One of my Iphones is no longer detected by the itunes/computer that it is synched with.  The computer/itunes does detect other devices.  The iphone in question is able to be detected on another computer/itunes.
I updated software oof iphone on another computer.  I updated itunes on the computer that does not detect the phone.  I rebooted both.  I tried software conflict.
Does anyone have an idea how to resolve?  I have all of my contacts, apps, photos, music etc on that computer. 
When I updated phone software on another computer to see if that was the problem it wiped out all music,apps, photos etc on the phone.  I have thee devices with one apple id and they are synched to different computers. 

You should try another USB cable, charging and sending data through the cable is not completely the same, sending data is using other contacts inside the plug or docking connector.

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