After two seconds the image returns to normal without any input on the keyboard or track-pad. The problem Monitor will go black for a few seconds randomly throughout the day. I have a problem with only one of the monitors and it only surfaced recently after an upgrade to macOS Ventura 13.3.1. These steps are outlined in this article and can help resolve this behavior: If your external display is dark or low resolution - Apple SupportĮxternal Monitor goes black for a few seconds randomly throughout the day I have a MacBook Pro 16-inch 2019 that I use with two external monitors. Check your display's documentation or the manufacturer's website for details." If your display is not made by Apple, make sure that it's using the latest firmware from the manufacturer.Install the latest macOS updates, which also deliver firmware updates for displays made by Apple.Software can affect display detection, the quality of the image on your display, and the resolutions and refresh rates available to your display. If you can't do that and your display is dark, the display might not have power, or it might be malfunctioning. If your external display is not made by Apple, you might need to use its built-in controls and menu system to adjust brightness.Or choose Apple menu > System Settings (or System Preferences), then click Displays and use the brightness control there. If your keyboard and external display are made by Apple, you can use the Brightness Up key on the keyboard to increase brightness.If your display is dark, make sure that its brightness hasn't been turned down. Learn more about allowing accessories to connect.
If you don't allow it to connect, your display remains dark. When connecting a display to a Mac laptop computer with Apple silicon, your Mac might ask you to allow this accessory (your display) to connect. Then press and release the power button to turn it back on. If you can't restart your Mac, press and hold its power button for about 10 seconds to turn it off.
Press and hold the Option key to show the Detect Displays button, then click the button. Choose Apple menu > System Settings (or System Preferences), then click Displays.On Mac laptop computers, you can close the lid for a few seconds, then open the lid again. It might help to turn off the display first. Disconnect the display from your Mac, then reconnect it.Use one or more of these steps to try again to detect your display. If your Mac can't detect your display, your display will be dark. To find out how many displays you can connect, and at which resolutions and refresh rates, check the specifications for your Mac model: These limits vary by Mac model, and by the resolution and refresh rate of other connected displays. Your display will be dark or use a lower resolution or refresh rate if you configure it to exceed the maximum resolution or refresh rate that your Mac can use. Your display will be dark if it exceeds the maximum number of displays that your Mac can use at the same time. 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 not sure about your adapter, try a different adapter or replace the video cable with one that doesn't require an adapter. Thunderbolt and USB-C adapters must also be compliant with DisplayPort Alt Mode, Thunderbolt 3, or Thunderbolt 4. If you're using an adapter with your video cable, the adapter must support your display's resolution and refresh rate. Learn more about how to connect a display to your Mac. Make sure that your display's power cable and video cable are connected securely and correctly at both ends. We recommend for you to follow these steps: There are steps available to help troubleshoot an external display when it's not functioning properly.