USB Audio on 27" Cinema Display doesn't work on 27" iMac

I have a new 27 inch display paired with my 27 iMac (i7), When selecting "Display Audio" as a sound output device it does nothing and switches right back to Headphone port. And I have installed the 27 inch update before the display arrived... does anyone else have the same issue with their display?
Thanks,
/b

I had this problem with USB SoundSticks. Here is your solution:
Delete the com.apple.soundpref.plist from the *MAIN LIBRARY>PREFERENCES* - (not the users library PREFERENCE folder).
Again, in the same *MAIN LIBRARY>PREFERENCES* folder, go into the AUDIO folder and delete com.apple.audio.DeviceSettings.plist and com.apple.audio.SystemSettings.plist
Reselect the sound device you want as your default in the Sound Preference Pane.
Restart your computer.
And PRESTO!!!! works like a dream.

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