Apple’s Worldwide Developers Conference to kick off June 10 at 10 a.m. PDT with Keynote address

The Keynote will be available to stream on apple.com, the Apple Developer app, the Apple TV app, and the Apple YouTube channel. On-demand playback will be available after the conclusion of the stream.

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Jtrain429 Author

Level 1

5 points

2019 MBP running Catalina 10.15.1 will not detect Thunderbolt Display

I have an Apple 27' Thunderbolt Display that I have used with my old MBP on Sierra. I now have a 2019 MBP running Catalina 10.15.1 and it will not detect the monitor. I am connecting using a USB-C to Thunderbolt adapter. I have reset NVRAM and tried with MBP connected to power source, and nothing works. Problems with external monitors and Catalina OS seem common based on research. Any ideas of how to fix this?

MacBook Pro with Touch Bar

Posted on Jan 19, 2020 9:37 AM

Best reply

Kappy

Level 10

361,765 points

Posted on Jan 19, 2020 11:03 AM

These may help: Adapters for connecting a display to the Thunderbolt 3 (USB-C) port on your Mac and see About the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple Support.

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2019 MBP running Catalina 10.15.1 will not detect Thunderbolt Display

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