Laptop Not Detecting External Monitor

Solution 1: Check Display settings

Under Display settings, there is an option for Multiple Displays. If your laptop won’t detect the second monitor, this option will not show, or it doesn’t detect an external monitor.

If the monitor is detected, the Multiple Displays option will appear in the drop-down menu list next to Display.

In case it is not appearing under this drop-down list, click Detect, ensuring the monitor you want to extend to is turned on and plugged into your video port correctly.

Also, select the correct source labeled on your monitor’s controls so that you’re using the correct video port.

Solution 2: Run Hardware and Devices troubleshooter

If your laptop won’t detect the second monitor, then run the Hardware and Devices troubleshooter to resolve the issue.

This checks for commonly occurring issues and ensures any new device or hardware is correctly installed on your computer.

Here’s how to go about it:

Right-click Start
Select Control Panel
Go to the “View by” option on the top right corner
Click the drop-down arrow and select Large icons
Click Troubleshooting
Click View all option on the left pane
Click Hardware and Devices
Click Next to run the troubleshooter

Follow the instructions to run the Hardware and Devices troubleshooter. The troubleshooter will begin detecting any issues that may be causing your laptop not to detect the second monitor.