Can't find option to unlock brightness button lock on Cinema Displays

Greetings
Mac OS X 10.5.4
Mac Pro running two Cinema Displays, a 20" and a 30".
The 20" brightness buttons work.
The 30" brightness buttons are locked out.
Go to System Prefs>Displays> and I don't see anywhere to unlock the brightness buttons.
Sorry if stupid question -
where is the unlock?
Thanks
GFB

OK, called Apple and solved problem:
In order to have control over the monitor, the USB cable must be connected!
Learn something new everyday!
I was not using the USB slots on the back of the monitors, so I has never connected the USB cables on the monitor snake to the computer.

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