Currently Being ModeratedJan 11, 2012 12:00 AM (in response to OBE2011)
Plug in the USB tentacle that comes out of the display, crazy but that is needed in order for the System Preferences to enable the Brightness slider. I know, it took me about 2 hours of drilling through doucmentation to find this.
This software updates the System Preferences pane where you can change Ambient Light Sensor settings. Enable the option "Automatically adjust brightness as ambient light changes" to turn the ambient light sensor on and off. Use the slider to adjust the brightness level.
Note: You must have the cinema display's USB cable connected directly to your Mac to access this functionality.
Currently Being ModeratedSep 9, 2012 5:22 PM (in response to donaldo777)
Thank you very much for this. I was getting frustrated following the Apple documentation that failed to point out the importance of plugging in the monitor USB plug
Currently Being ModeratedSep 9, 2012 11:42 PM (in response to donaldo777)
Thanks for this, I am in the same boat however I am runniing 10.7.3 and that update will only work on 10.6.
Any suggestions on where to find a newer patch would be awesome.
Thanks - Nick
Currently Being ModeratedSep 10, 2012 2:32 AM (in response to Nick F-J)
Fixed it - download and run the EIDID Reset Tool if you are on 10.7
Currently Being ModeratedNov 6, 2012 5:20 AM (in response to Nick F-J)
Thanks Nick F-J! This is what solved my problem. I recently had my LED 27" Cinema Display repaired. They replaced the logic board. However, they apparently didn't know or forgot to reset the EIDID. Using the link you provided to download the EDID_Reset_Tool.dmg and following the instructions solved the problem.
Since I am running Mountain Lion 10.8.2, I had to do one extra thing and that is to use the Ctl-Click and Open on the program since it was not identified as a APP downloaded from the App Store (a new "safety" feature in Mountain Lion but they forgot to update all of their own software to be). Doing this allowed me to run the APP.
Currently Being ModeratedFeb 13, 2013 7:38 AM (in response to Renaissance Man in Taiwan)
Renaissance Man in Taiwan,
I also had the same problem and am running Mountain Lion 10.8.2. I downloaded the EDID Reset Tool dmg and couldn't open the program even when doing Ctl-Click. Nothing happens. Is there a certain program I need to open this file?
Currently Being ModeratedFeb 13, 2013 7:46 AM (in response to dlisanto)
No, you don't need to specify any software. Just hold down the control modifier key and click on the file. A popup menu should show up and then select "Open", not "Open With". If you do select "Open With", then select the default, which is DiskImageMounter. You should see "EDID Reset Tool" appear mounted on your desktop or under "Devices" in a finder window.
Currently Being ModeratedFeb 13, 2013 7:57 AM (in response to Renaissance Man in Taiwan)
Thanks, I actually just opened up a Finder window and loaded it from the sidebar and it worked.
Currently Being ModeratedFeb 13, 2013 8:00 AM (in response to dlisanto)
You probably have your preferences so that these mounted devices don't show up on your desktop so that is why you felt like nothing happened when you did the ctl-click open sequence.
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