How to Fix Second Monitor Not Detected On Windows 11
Sometimes the system may encounter the problem of not being able to detect the second monitor. In this article, we will explain in detail how to fix Windows 11 can not detect the second monitor problem.
1. Check the Physical Connection
First of all, make sure the physical connection of the monitor is correct:
Make sure the video connection cable (such as HDMI, DisplayPort or VGA) is firmly plugged into the ports of your computer and monitor. If possible, try replacing the cable to rule out the possibility of a faulty cable.
Make sure the second monitor is powered on and turned on. Check that the monitor's power indicator is on.
2. Update the Graphics Card Driver
Driver problems are one of the common reasons why the second monitor cannot be detected. Updating the graphics driver promptly can effectively prevent such errors. Using a tool like Driver Sentry can save time and help you avoid downloading or installing incorrect drivers.
Download the latest version of Driver Sentry, install it, and open the software. Click "Scan".
After the scan, identify the graphics card driver in the results list and click "Upgrade".
Restart your computer after updating the drivers to ensure the changes take effect.
3. Adjust the Display Settings
Sometimes, incorrect display settings may cause the system to fail to detect the second monitor. You can try the following methods:
Right-click on a blank space on your desktop and select "Display Settings".
On the Display Settings page, click the "Detect" button under "Multiple displays" and the system will try to detect the connected monitor.
Under "Multiple displays", make sure that the correct display mode is selected (e.g. "Expand these monitors" or "Duplicate these monitors"). If the system still does not detect a second monitor, try switching to a different display mode.
4. Check the Monitor Input Source
Make sure the input source of the second monitor is set correctly:
Using the monitor's control panel or menu buttons, check and adjust the input source settings to ensure that the correct video input source (e.g., HDMI, DisplayPort, or VGA) is selected.
5. Running the Troubleshooting Tool
Windows 11 comes with a hardware and device troubleshooting tool that can help detect and fix monitor connection issues:
Press 'Win + I' to go to the Settings page.
Select "System" > "Troubleshooting" > "Other Troubleshooting".
Select "Display issues" and click "Run", and follow the prompts to complete the detection and repair.
6. Reset Display Adapter
Resetting the display adapter can help solve some temporary problems:
Press the 'Win + Ctrl + Shift + B' key combination, the screen will blink and reset the display adapter. Once done, check if the second monitor can be detected.
7. Check Resolution And Refresh Rate
Incorrect resolution and refresh rate settings may prevent the monitor from working properly:
In the Display Settings page, select the second monitor and adjust its resolution, making sure it is set to a resolution supported by the monitor.
In the Advanced Display Settings, select the second monitor and adjust its refresh rate to ensure that it is set to a refresh rate supported by the monitor.
8. Replace the Display Interface
If the above methods still can't solve the problem, you can try to change to a different display interface:
If you are currently using HDMI interface, you can try using DisplayPort or VGA interface to see if it solves the problem.
The above is how to fix the problem of Windows 11 not detecting a second monitor, hope it helps you.
See also:
Guide to Fix Low Volume in Windows 10
