HT201177: Get help with video issues on external displays connected to your Mac
Learn about Get help with video issues on external displays connected to your Mac
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Helpful answers
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Jun 21, 2012 11:39 PM in response to Andrewneaveby AnaMusic,Command-Option-8
Then go to System Preferences > Universal Access
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Jun 22, 2012 3:45 AM in response to Andrewneaveby noondaywitch,Alternatively, hold the ctrl key and scroll backwards.
You can disable that in the Keyboard pane of System Preferences.