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

Here is how to connect a Lenovo ThinkVision monitor to a Windows laptop and experience two screens. Check ports on your laptop & monitor Make the connection Connecting to dual ThinkVision via USB-C ...

The HDMI port on your motherboard or GPU usually connects to your primary monitor. If you're using a relatively new graphics card and monitor, your HDMI port is probably vacant, considering many ...