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