On Windows 10 and 11, you can use these steps to fix a second monitor not detected on your PC, and here's how.

Most of the time it is the driver issue that causes the issue of the second monitor not working after the update. If the Second monitor not displaying in Windows 11/10 after Windows Update, NVIDIA ...

Use the following fixes if your mouse cursor won’t move to the second monitor on your Windows 11/10 computer. Check your monitor alignment Disconnect and reconnect your displays Set your Displays to ...

To use an iPad as a second screen on a Windows 10 computer, you'll need to use a third-party app like SplashTop.