How to fix a second monitor not being detected on Windows 10 and 11

Summary

This guide helps you troubleshoot and resolve: How to fix a second monitor not being detected on Windows 10 and 11. Follow the steps below to fix the issue.

Common Causes

Connecting a second monitor is a great way to boost productivity, but sometimes Windows 10 or 11 won't recognise the new display. This issue is usually caused by a loose cable, an incorrect display setting, or an outdated graphics driver. Follow the steps below to get your second screen working.

Quick Fix Steps

1. Check that both monitors are powered on and switched to the correct input.
2. Ensure the video cable is firmly connected at both the monitor and computer ends.
3. Press Win + P and select Extend to force Windows to detect the display.
4. Restart your computer while both monitors remain connected.

Detailed Instructions

Check Your Cable Connections

A loose or faulty cable is the most common reason a second monitor goes undetected. Power down your computer, unplug the video cable from both the monitor and the PC, then reconnect it firmly. If you are using an adapter (for example, USB-C to HDMI), ensure it is securely seated. If possible, test with a different cable to rule out a damaged lead.

Use the Display Settings Panel

Sometimes Windows needs a nudge to search for a newly connected screen.

1. Right-click on the desktop and select Display settings.
2. Click the Detect button if it is visible. In Windows 11, you may need to click the Multiple displays section to expand it first.
3. Under Multiple displays, use the dropdown menu and select Extend these displays.
4. If a display appears in the settings window but is greyed out, click on it and select Extend desktop to this display from the dropdown.

Update Your Graphics Driver

An outdated or corrupted graphics driver can prevent Windows from detecting external displays. You can check for updates through Windows Update or directly from your hardware manufacturer.

1. Right-click the Start button and select Device Manager.
2. Expand the Display adapters section.
3. Right-click your graphics card and select Update driver.
4. Choose Search automatically for drivers and follow the prompts.

Check Display Input Source

Monitors with multiple inputs will not automatically switch to the correct port. Use the physical buttons on your monitor to open its menu and manually select the input source that matches the cable you are using (for example, HDMI 1 or DisplayPort).

Troubleshooting

Roll Back a Recent Driver Update

If the second monitor stopped working immediately after a Windows update, rolling back the graphics driver may resolve the issue.

1. Open Device Manager and expand Display adapters.
2. Right-click your graphics adapter and select Properties.
3. Go to the Driver tab and click Roll Back Driver.
4. Follow the prompts, then restart your computer.

Test With Another Port or PC

If your graphics card has multiple outputs, try plugging the monitor into a different port. If the monitor still is not detected, connect it to a different computer entirely. This helps determine whether the fault lies with the monitor, the cable, or your computer.

Check Project Mode

Windows uses projection modes to manage displays. Press Win + P to open the Project menu. If PC screen only is selected, Windows will ignore the second monitor. Choose Extend or Duplicate to activate it.

If you have worked through these steps and your second monitor is still not being detected, please Open a Ticket and our support team will assist you further. You may also find our guides on Screen brightness adjustment and Sound not working helpful when configuring your new display setup.

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