Follow the instructions here to make sure your external monitor is connected properly.
Usb C Not Working For Connection To Displays Mac From RecognizingEven a slightly loose connection can prevent your Mac from recognizing the attached display.Try attaching your MacBook to a power outlet to see whether this gives your laptop the juice it needs to power an external monitor.
![]() To select a new profile, navigate to System Preferences - Displays Color, then explore the various color profiles on the list. You may also want to fix your Mac not starting up issue, if that is why your external display doesnt work. Usb C Not Working For Connection To Displays How To Set UpWe also have an in-depth guide on how to set up a generic USB keyboard for your Macbook. If I let it boot up on its own it can take 1-3 hours to start the OS. When this happens, I unplug the external connections (HDMI, USB, etc). This doesnt happen all the time, just about once every other week. Unplugging all the external connections and getting the OS up a running, then plug the external connections back in seems to solve the problem. MacOS starts up without a problem. But when it has issues, the external connected devices (mouse, displays, etc) can cause serious slowness.
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