Cinema Display Help needed


hello,

have setup 23i cinema display mac pro

have connected usb , firewire cable mac pro.. , keyboard attached of display

reason can not seem adjust brightness of display keyboard (though can side of monitor)

neither can see brightness slider bar in display settings...

while display the power led in front blinks 3 times, there little pause, , blinks 3 times again... (dont know if means anything)?

can me figure out how fix brightness control issue display

thanks





ps have reseted pram , nvram... still nothing has changed

note not have , options tab reason.... (i have tried plug display's usb 3 usb of macpro... still nothing)
 

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i having exact same problem 09 mac pro , 24" cinema display. there fix this? cannot control brightness , not seeing control bar. works fine mbp unibody not on mac pro. help?
 


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