HT201343: Use AirPlay to display video from your Mac on an HDTV
Learn about Use AirPlay to display video from your Mac on an HDTV
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Helpful answers
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Aug 11, 2012 10:45 PM in response to DIN-DINby nab004,Press option when in the displays System Preference pane. A little "Detect Displays" button should pop up in the lower right. Really wish they hadn't hidden this.
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Aug 11, 2012 11:49 PM in response to nab004by DIN-DIN,I tried holding down option, but then nothing happens when I click "Detect Display" :[
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Aug 12, 2012 1:24 AM in response to quicksilver8by DIN-DIN,Nothing has been working :[ I hope they fix this soon with an update
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Aug 23, 2012 7:45 AM in response to DIN-DINby dlivdahl,I have a similar problem. I have two DELL U2410 displays (NVIDIA GeForce 9400M 256 MB graphics) connected to my Macbook Pro using a Diamond dual monitor adapter and they both worked fine with Lion but now only one of them is detected after upgrading to Mountain Lion. I tried resetting the PRAM but that did not change anything. Checked cables, everything else appears normal.
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Oct 4, 2012 10:10 AM in response to DIN-DINby GIC1969,I have had the same problem since upgrading. To get it to work, every day I have to unplug the Thunderbolt cable and plug it back in.