Sync with iMac,  Thin vertical colored lines = Catastrophe

Hey guys,
An interesting and tragic event occurred when i tried to sync my iPhone with my iMac last night. It started to sync then itunes froze, then my iMac's entire screen switched to thin vertical colored lines. The only way to fix it was to restart the computer.
I tried restoring both the phone and the mac. it appears to only happen when I'm actually adding stuff to the phone (podcasts, apps, etc.) Also, mt nano syncs perfectly.
any ideas?
Thanks,
Nick

I just started having this with my iPod Touch and my Macbook. I posted a message as well. Someone suggested I try de-authorizing and authorizing my computer. So far I am syncing and got further then before. Try that. Try to open itunes and then de-authorize, then re-authorize and play a song or something bought from Itunes, then dock your iPhohne and sync.

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