Is the display's USB cable plugged into the computer? It is needed for brightness control.
If that isn't the problem, try the EDID Reset Tool:
<http://download.info.apple.com/Apple_Hardware_Test/ EDID_Reset_Tool.dmg>
Is the display's USB cable plugged into the computer? It is needed for brightness control.
If that isn't the problem, try the EDID Reset Tool:
<http://download.info.apple.com/Apple_Hardware_Test/ EDID_Reset_Tool.dmg>
Is the display's USB cable plugged into the computer? It is needed for brightness control.
If that isn't the problem, try the EDID Reset Tool:
<http://download.info.apple.com/Apple_Hardware_Test/ EDID_Reset_Tool.dmg>
thank you, I'm not connected to a computer usb
27" LED Cinema Display A1316, no brightness control (Maveriks 10.9.4)