New MacBook air and Iphone 4 won't connect via CABLE

Hi, hoping someone can help.
I bought a new MacBook Air a few days ago however when I insert my USB cable to connect it to my Iphone 4 to sync to my Itunes it will not recognise or charge the device, let alone sync. It simply flickers between charge and not charge so seems to be connecting for 0.2 of a second then goes off instantly afterwards- which allows many warning notices to appear on my macbook air. I have no idea what to do and I cannot even sync to Itunes.
My Iphone still works and syncs with my other PC and the cable is in good working order......
Any response would be fantastic.
Regards

If the phone still syncs to the other computer and you are using the same cable then the problem must involve the computer. Try performing a reset of NVRAM and PRAM.
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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