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External Monitor turning on and off

I have a MacBook Pro purchased in 2019.

I have attached an external monitor and after starting up the external monitor goes blank for 10 seconds comes back on for 1 second and then off again.

I have rebooted in safe mode and the external monitor stays on.

I am assuming that there is some setting that is making it turn on and off when booting up normally.

Anyone got any ideas where I should look.

Thanks

MacBook Pro 16″, macOS 11.1

Posted on Jan 5, 2021 3:14 AM

Top-ranking reply

Sharhari

Level 5

6,293 points

Posted on Jan 5, 2021 7:45 AM

Please see: Get help with video issues on external displays connected to your Mac - Apple Support

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External Monitor turning on and off

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