IPhone tethering via USB not working

Hi,
Since last week my iMac can't recognize my iPhone in Network Preferences, when I plug my iPhone in my macbook the problem is gone, so I tried to reset  Network Preferences in iMac and nothing changed I also tried coping Network Preferences from my macbook -since tethering is working fine there- and nothing changed.
So if anyone have any clue how to solve my problem I will be grateful.
Thank you.  

Try This :
Copy /System/Library/Extensions/AppleUSBEthernetHost.kext to a backup folder (Desktop) and delete the original
Re-download the latest version of iTunes (http://www.apple.com/itunes/download/)
Install iTunes, this will update your "AppleUSBEthernetHost.kext" file.
Disconnect USB-connection to iPhone
Re-connect iPhone via USB

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