If the basic troubleshooting steps outlined above do not fix the second monitor, you can troubleshoot the software.

Update the external monitor firmware to help fix bugs and compatibility issues (uncommon).

If you have a Surface Pro 7 connected to a dock station, disconnect it and try to connect the monitor directly into the tablet 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 monitor.

Connect another known working monitor to determine that the issue is not the graphics card.

Connect the monitor to another computer to see whether the problem is with the monitor.

Change ports if the monitor and graphics card include multiple ports.

DisplayPort and HDMI come in different versions, which means you must also check the manufacturer for requirement details to ensure you have the correct cable.

Try a different signal cable to confirm you are not dealing with a bad cable.

Disconnect the signal cable from both ends, wait about a minute, and reconnect it again firmly.

Check the signal cable connection between the monitor and the PC's graphics card.

Use the monitor's built-in controls and select the correct input port.

Turn off then turn on the computer to refresh the connection.

Confirm the monitor is connected to a power source.

If the monitor does not show up in the settings, try these steps before changing the configuration settings on Windows 10: When the desktop or laptop does not detect the second external monitor, it could be a problem with the software, but it might also be an issue with the physical connection.

How to fix external monitor connection issues via hardware troubleshooting

How to fix external monitor connection issues via latest graphics driver.

How to fix external monitor connection issues via Settings.

How to fix external monitor connection issues via hardware troubleshooting.

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