Second monitor is not working
Second monitor is not working

Have you connected a second monitor to your computer, but it’s not being detected? Here’s a handy guide to help you resolve this issue.

UPDATE FOR WINDOWS 11: A very common problem Windows 11 users are having with 2nd monitors is related to the built-in graphics drivers that auto install with the operating system. Search for the latest updated driver FIRST and/or go to the manufacturer page and download a driver from them to see if your issue is with the built-in Windows 11 drivers.

Why is a Second Monitor Useful?

A second monitor can greatly enhance productivity and multitasking. It allows you to extend your workspace, making it easier to manage multiple applications simultaneously.

Common Issues for Not Detecting a Second Monitor

There could be several reasons why your second monitor is not being detected. Here are a few possibilities:

Hardware Problems

The issue might lie with the monitor itself or your computer’s video output port.

Incorrect Display Settings

Your computer might not be set to extend or duplicate the display to a second monitor.

Outdated Display Drivers

Outdated or incompatible display drivers can cause the second monitor to not be detected.

Faulty Cables

The cable connecting your computer to the monitor might be defective.

Wrong Input Source

The monitor might be set to the wrong input source.

Troubleshooting Steps

Now let’s walk through some steps to troubleshoot this issue:

Checking Hardware Components

Ensure the second monitor and the video output port on your computer are functioning correctly.

Adjusting Display Settings

Check your display settings. Ensure they are set to extend or duplicate the display to the second monitor.

Updating Display Drivers

Update your display drivers to the latest version. Visit your computer manufacturer’s website for the most recent drivers.

Inspecting Cables

Inspect the cable connecting your computer to the monitor. Replace it if necessary.

Switching Input Source

Check the monitor’s input source settings and ensure it’s set to the correct source.

When to Seek Professional Help

If you’ve tried all of the above and your second monitor is still not detected, it may be time to seek professional help. A certified technician can diagnose and fix the problem.

Maintaining Your Monitor Setup

Regular maintenance can prevent such issues in the future. Keep your hardware clean, update your drivers regularly, and check your cables and ports for any signs of damage.


A second monitor can be a valuable tool, but only if your computer can detect it. By following these troubleshooting steps, you should be able to resolve any issues and get back to enjoying the benefits of a dual monitor setup.


  1. Why is my computer not detecting my second monitor?
    • Issues can range from hardware problems, incorrect display settings, outdated drivers, faulty cables, or the wrong input source on the monitor.
  2. How do I get my computer to detect a second monitor?
    • Check your hardware, adjust your display settings, update your display drivers, inspect your cables, and ensure your monitor is set to the correct input source.
  3. Why is my second monitor not showing up in display settings?
    • This could be due to outdated display drivers or incorrect display settings.
  4. What do I do if my HDMI is not detected?
    • Check the HDMI cable for any faults, ensure your display drivers are up-to-date, and check that the correct input source is selected on your monitor.
  5. Can a faulty cable cause a monitor not to be detected?
    • Yes, a faulty cable can definitely cause detection issues. It’s always a good idea to check or replace cables when troubleshooting.
Eric Chan

Hi! I’m Eric and I work on the knowledge base at  You can see some of my writings about technology, cellphone repair, and computer repair here.

When I’m not writing about tech I’m playing with my dog or hanging out with my girlfriend.

Shoot me a message at if you want to see a topic discussed or have a correction on something I’ve written.

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