I downloaded the EDID Reset Tool for my 27" Cinema Led Display and the instruction tells me to "Connect LED Cinema Display (27-inch) to begin. However, the display is already connected. I've restarted. I've started without the display connected and then connected it, but I can't get that instruction to go away and the "reset EDID" is pale grey and can't be activated.
Thank you thank you!
Back in Dec 2011 I had a 27" Cinema Display repaired and this happened. Took it back to the store and they assumed the board was bad. Gave me a new display.
Fast forward to this past week Jun 2013....had the display in to have the LCD replaced because of smudge like marks. Sure enough I get home and same issue....no brightness controls!
I searched and found this thread. Downloaded the tool and voila! Brightness controls back.
Surprised the geniuses don't know about this!