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Jan 14, 2016 6:46 AM in response to zkytghxby Brett L,Hi Buttscratcha,
It sounds like you are having an issue with your MacBook Air not using your external display since you updated your operating system to Mac OS X 10.11 El Capitan. Is that right?
I would suggest that you troubleshoot using the steps in this article - Get help with video issues on external displays connected to your Mac.
There is a link in the article to an article on how to reset the System Management Controller which I will give here as well - Resetting the System Management Controller (SMC) on your Mac.
Thanks for using Apple Support Communities.
Sincerely.
