8 Solutions for Dual Monitor Not Detected or Extending Issues on Windows

Key Notes

• Ensure all cables are properly connected and in working condition.
• Use the Windows + Ctrl + Shift + B keyboard shortcut for troubleshooting.
• Consider refreshing both monitors to reset connections.

Resolving Dual Monitor Detection Issues on Windows: A Comprehensive Guide

This guide provides a detailed approach to troubleshooting dual monitor detection issues on Windows, ensuring users can effectively set up their monitors.

Before You Begin

Before diving into the troubleshooting steps, it’s essential to confirm a few details regarding your hardware setup:

• Verify that your computer supports dual monitor functionalities. Check the specification to confirm display port compatibility.
• Utilize the keyboard shortcut Windows + Ctrl + Shift + B to diagnose issues.
• Ensure that both monitors are connected to the same wireless network if you’re using a wireless display setup.
• Check for additional power needs for your monitor separate from connection cables.
• Inspect your connection cables for wear and tear or consider replacements.
• If possible, disconnect additional peripherals to rule out interference.
• Avoid using splitters as they duplicate the same output; use separate ports instead.
• Ensure all connections are tight and the monitor’s power light is active.
• Lastly, find out if your HDMI and USB-C ports support extended displays.

1. Turn Off Monitors Before Connecting

Power down both monitors before reconnecting them. Often, a reset can help the operating system to identify the newly connected display.

2. Enable Extend Option in Windows

To change the default mirror setting to extend mode:

Press Ctrl + P and select Extend.

3. Force Detect Second Monitor Manually

If Windows fails to detect the second monitor:

Access the Display Settings and click on Detect under the multiple display settings.

4. Check Scale and Resolution

Adjusting resolution and scaling settings may help if detection issues persist:

Open Settings using Windows + I , navigate to System > Display.

• Select the undetected monitor and experiment with different scaling and resolution settings. Aim for the recommended settings if available.

5. Set Same Refresh Rate

Matching refresh rates across monitors can resolve detection problems:

• Retrieve the settings through Settings > System > Display, then click on Advanced display settings to sync refresh rates for both screens.

6. Update Display and Graphics Card Driver

Outdated drivers can hinder dual monitor performance:

Access Device Manager from the Start menu, find the graphics driver, and update to the latest version.

7. Uncheck HDR for Second Monitor

Sometimes HDR settings cause problems when extending monitors:

Navigate to Settings > System > Display, choose the connected monitor, disable HDR video streaming, and check for improvements.

8. Delete Registry Key

In case of issues saving display settings, Microsoft recommends removing a specific registry key:

Open the Registry Editor by searching via Windows + S , and delete the configuration under HKEY_CURRENT_USER\Software\Microsoft\MobilePC\TMM.