Previous 1 2 Next 21 Replies Latest reply: Jan 19, 2016 4:13 PM by lenbom Go to original post
  • thomasinfromca Level 1 Level 1

    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.

  • thomasinfromca Level 1 Level 1

    I got it to work. Not sure how. Thank you. Brightness control is back.

  • J Rye Level 1 Level 1

    I had the same problem: "Reset EDID" was inactive/ greyed out.
    However i found out that my cinema display usb-cable was not plugged in to my macbook pro. Once i did this, the "reset EDID" button became clickable!

  • mainecat Level 1 Level 1

    Thank you for this tip. I have been suffering in darkness, now I can see! This information should be easier to find.

  • jmarshal Level 1 Level 1

    The button was greyed out for me as well even with the USB cable plugged in.  I disconnected and reconnected the USB cable and it worked.

  • netnothing Level 1 Level 1

    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 brightness controls!


    I searched and found this thread.  Downloaded the tool and voila!  Brightness controls back.


    Surprised the geniuses don't know about this!



  • lenbom Level 1 Level 1

    After running the EDID reset tool, my display still did not show brightness control.  I found out that you may need to unplug the display for more than 2 min. to get a proper EDID reset.  The 10 sec. given in the instructions was not enough in my case.  Hope this helps somebody.

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