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external monitor no signal

I have a Macbook pro 16 of 2019, working great with the lid closed using an external monitor. Suddenly one day when I close the lid my external monitor gets black and says "no signal input" if I open the lid, the cover... everything works great both on mirror display and as extension... but i prefer to work with my lid closed on one screen only. is there any solution for this??? i use Catalina and don't want to upgrade to big sur... thank you

MacBook Pro 16″, macOS 10.15

Posted on Apr 1, 2021 6:33 AM

Best reply

dominic23

Level 10

83,916 points

Posted on Apr 1, 2021 7:13 AM

Reset SMC: How to reset the SMC of your Mac - Apple Support Choose the appropriate method.

Startup in Safe mode. https://support.apple.com/en-gb/HT201262

To leave Safe Mode, click  in the menu bar and choose “Restart”

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external monitor no signal

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