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Aug 29, 2015 10:55 AM in response to RickBergerby norm123,Hello Rick,
I know that it can be annoying to consistently change the display and audio settings. Let's see if we can get it sorted out.
I would first take a look at the article below if you have not done so already. I would start with the "Reset the system" section to go over resting the SMC and parameter RAM. You might also want to reseat the cables or change the order in which they are plugged in to see if that changes things.
Apple computers: Troubleshooting issues with video on internal or external displays
https://support.apple.com/en-us/HT201177
Have a great day
