Usually, Windows 10 can't detect the second monitor due to the incompatible display driver. We recommend that you update your display driver and check if the issue persists. To update the display driver, download the latest one from your monitor manufacturer’s website. If you need further assistance, let us know.Why doesn't windows detect my second monitor?
How to get Windows 10 to detect your second monitor Method 1 - Manually detect Monitor settings. If you still can't detect the second monitor in Windows 10, then you may have to try manually detecting the display settings to ... Method 2 - Rollback driver to the previously installed version. ... Method 3 - Update driver for display. ... Method 4 - Change your monitor frequency. ...Why is my monitor not detected?
Sometimes, a damaged cable or port might prevent the monitor from being detected. Try a different cable than the one you’re using. Try connecting the monitor to a different system. Try connecting a different monitor to your system.