Make sure the cable is securely connected to the video connectors on the display and the computer. Make sure the cable is not longer than the maximum specified in the display’s specifications. Restart the display and any connected computers. See Setting the resolutions and refresh rates of computers you want to connect to the display. Set the connected computers’ resolution and refresh rate to values that the display supports. Make sure any connected computers are on and not in Standby mode. You’re experiencing the following or similar issues with video: The display may not work properly if the display’s firmware is not updated. Make sure the display’s firmware is updated to 1.8.7 or later. You’re experiencing the following or similar issues with image quality:
