Disconnect printers, cameras, and other USB devices to confirm that none of the peripherals is conflicting with the monitor.
Connect another known working display to determine the issue isn't the graphics card.Connect the monitor to another computer to confirm whether the issue is with the monitor.Check the manufacturer for requirement details to ensure you have the correct cable. DisplayPort and HDMI cables have different variations.Change ports if the monitor and graphics card have different ports.Connect a different video cable to discard a problem with the cable.Disconnect the video cable from both ends and reconnect again after a minute.Find the display controls and switch to the correct input port.Confirm the signal cable connection between the device and the display.Power off the computer and restart it to refresh the connection.
