Unable to sync iPhone

Hey gang,
I'm trying to synch my iPhone to my new iMac, yet am completely unable to. I get the "session cannot be started" error message. I've tried everything:
- resetting the iPhone
- setting up a guest account with admin powers
- reinstalling iTunes
- repairing disk permissions
- deleting the old backup files
Nothing has worked. It won't let me restore, either.
More info: When I bought my iPhone last year, I synched it to my MacBook Pro. It still synchs like a champ with that. The Migration Assistant should have transferred all of my permissions and accounts from the MacBook, yet the iPhone refuses to synch with the new iMac.
Any ideas? I'm about to pull my hair out.

Hi,
Connect your iPhone to your iMac. Launch iTunes if you don't have it set up to open automatically.
Select your iPhone under Devices on the left. Now from the iTunes menu bar click: Store / Authorize This Computer.
Now try syncing. If it still won't sync, reset the iPhone then sync.
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears.
Carolyn

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