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Anyone having issues with external monitor not working with Catalina 10.15.5?

My external monitor stopped working with Catalina 10.15.5. Tried all options


  1. Restart
  2. Restart in safe
  3. Disconnect/connect everything
  4. Sleep mode
  5. Contact Monitor Vendor (Samsung)
  6. Calling apple support (was on hold for 1 hour)


Any thoughts, suggestions! working on small monitor isn't cutting it

MacBook Pro 16″, macOS 10.15

Posted on Aug 24, 2020 6:56 PM

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Question marked as Top-ranking reply

Posted on Aug 28, 2020 9:13 AM

I had the same problem, and tech support suggested reset the NVRAM.

Restart.

Hold Option + Command + P + R on startup until the Apple is lit or 2nd chime on certain Macs.

It solved my problem. Both monitors work now.

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Anyone having issues with external monitor not working with Catalina 10.15.5?

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