If you have a Surface device connected to a dock station, disconnect it and try to connect the monitor directly to the computer to confirm the problem is not the dock.Disconnect all peripherals (such as printers, cameras, and USB devices) to confirm none of the other devices are conflicting with the display.Connect another known working monitor to determine the issue is not the graphics card.Connect the monitor to another computer to confirm whether the problem is with the external display.
Change ports if the monitor and graphics card feature multiple ports.Check the manufacturer for requirement details to ensure you have the correct cable since DisplayPort and HDMI come in different versions.Change the signal cable to confirm the problem isn't the cable.Disconnect the signal cable from both ends, wait one minute, and firmly reconnect it.Check the signal cable connection between the display and the graphics card.Open the monitor's built-in controls and choose the correct input port.
