MacBook Pro will not send signal to external monitor

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Margery07 Author

Level 1

4 points

MacBook Pro will not send signal to external monitor

This issue has been posted by others. The link to the article from Apple Support is useless. Everything is connected.

System Preferences for Display shows a second monitor, but the monitor tells me "No Signal" and is black.

Mission Control does not show Desktop 2.

IN ADDITION, if I disconnect the monitor from the laptop, the laptop goes black and has to be shut down and restarted.

This is a MacBook Pro mid-2012 running Catalina.

The second display has been working fine with a MacBook Pro that is mid-2015 running Catalina.

Posted on Feb 4, 2021 8:42 AM

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Answer 1

Joseph_S.

Community Specialist

Feb 7, 2021 9:31 AM in response to Margery07

Hello Margery07,

Welcome to Apple Support Communities. We understand that you're having issues to get your external monitor to work with your Mac, and we'd be happy to provide some guidance.

If you haven't already, please follow the recommended steps in the following link:

Get help with video issues on external displays connected to your Mac

If you've tried these steps and your display still isn't working, contact Apple Support to get more help.

We hope this information is useful. Kind regards.

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MacBook Pro will not send signal to external monitor

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