![]() ![]() Learn what to do if your screen became dark after you changed its resolution or refresh rate. This limit varies by Mac model, display, the video cable and adapter used with the display, and the resolution and refresh rate of other connected displays. Your external display will be dark or use a lower resolution or refresh rate if you configure it to exceed the maximum supported resolution or refresh rate. Your external display will be dark if it exceeds the maximum number of external displays that your Mac can use at the same time. If your display is connected to a hub or dock, connect your display to a port directly on your Mac. ![]() If the display is connected to a Mac laptop computer with a closed lid, make sure that the Mac is connected to power and using an external keyboard and mouse. If you're using a Thunderbolt or USB-C adapter, it must also be compliant with DisplayPort Alt Mode, Thunderbolt 3, or Thunderbolt 4. Your external display will be dark or use a lower resolution or refresh rate if your video cable or any adapter you may be using with it doesn't support the resolution and refresh rate of the display. Learn more about how to connect a display to your Mac. Make sure that your external display's power cable and video cable are connected securely and correctly at both ends. ![]() If your Mac is working, but the external display connected to it has a blank or black screen (no video) or can't use its highest resolutions or refresh rates, try these solutions. If your external display is dark or low resolution ![]()
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