User profile for user: achap78
achap78 Author
User level: Level 1
22 points

Monterey 12.0.1. Second Monitor Issue

I just updated to Monterey 12.0.1. I have an iMac Retina 5k, 27-inch 2020 w/3.6Ghz 10 Core Intel Core i9; and have lost second display functionality. Both screens flicker on an off repeatedly when second monitor is connected to Thuderbolt port.

Posted on Nov 3, 2021 7:33 AM

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User profile for user: sten290
sten290
User level: Level 1
8 points

Posted on Dec 14, 2021 4:58 PM

I found the solution:


  1. Plugged in the dongle with the HDMI connection to the LED screen (2nd monitor)
  2. Turned on monitor
  3. Went to System Preferences
  4. Picked 'Displays' (different screen from hitting displays when monitor is not connected)
  5. Hit 'Display Settings'
  6. Changed the resolution to 720p
  7. Changed the refresh rate to 60hz


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Monterey 12.0.1. Second Monitor Issue

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