If you’re still having trouble, it’s possible that there’s an issue with your graphics card or drivers. Plug everything back in and turn it on to see if the issue is resolved.
Then let go of the keys and turn off your computer again. Turn on your computer and hold down Command + Option + P + R until you hear the startup chime three times (this may take a while). To do this, shut down your computer and unplug all external devices except for the keyboard, mouse, and power cord. Next, try resetting the display’s PRAM or SMC. Then click the Arrangement tab and see if there’s anything listed under ” Mirror Displays.” If there is, uncheck that box.
Make sure that the “Show displays in menu bar” box is checked. If that doesn’t work, open System Preferences and go to Displays. If everything is plugged in and turned on, but you’re still not seeing anything on the screen, try restarting your computer. First, make sure that both your computer and the display are powered on and connected properly.
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