How to Fix Second Monitor No Signal on Windows 10?

If you are working in some special fields like editing videos, using multiple apps at the same time, or playing games on your Windows 10 computer, you can connect a second monitor to your device to make your work easier.

After connecting a second monitor to your computer, you may find that the second monitor has no signal or second monitor not detected. If so, do you know how to fix this issue? In this post, MiniTool Software will show you some effective solutions.

Reasons for Second Monitor Not Detected/Second Monitor No Signal

First, let’s talk about the causes of 2nd monitor not detected.

This issue can be caused by many reasons like:

• The graphics driver is corrupted or damaged.
• The graphics driver is outdated.
• There are some hardware-related issues.
• And more…

Focusing on these issues, we collect some specific solutions. You can try them to help you out.

Method 1: Use Hardware Troubleshooting

If your Windows is not detecting second monitor, it is usually a hardware problem. You should make the following checks and fixes:

• You need to make sure that the monitor is correctly connected to your computer and the power source.
• The monitor should be turned on.
• Reboot your computer to fix the temporary issues and re-establish the connection.
• You can use the monitor’s built-in controls to check whether the correct input is selected.
• Use a different signal cable to check whether it is a cable issue.
• Check the Display Port and HDMI port to see whether you are using the correct cable.
• Use the monitor on another computer to check whether it is a monitor issue.
• Disconnect all peripherals like external hard drives, USB flash drives, or printers from your computer.

Method 2: Using Settings

You can also fix the second monitor not detected/second monitor not detected via Settings. Here are two things you can do:

Perform a Second Display Detection

1. Click Start.
2. Go to Settings > Display.
3. Click the Detect button under Rearrange your displays.

Connect the Second Monitor Wirelessly

If you connect the second monitor to your Windows using a cable, you can try to wirelessly connect it to see whether the issue disappears.

1. Click Start.
2. Go to Settings > Devices > Bluetooth & other devices.
3. Click Add Bluetooth & other device.
4. Click Wireless display or dock on the pop-up interface.
5. Make sure the wireless display is turned on and it is discoverable.
6. Choose the target display from the list.
7. Follow the on-screen instructions to finish the settings.

Method 3: Update/Reinstall/Rollback the Graphics Driver

If the graphics driver is corrupted or outdated, second monitor not detected or second monitor no signal can also happen. You can update or reinstall the device driver to have a try.

Update the Graphics Driver

1. Click Start.
2. Go to Settings > Update & Security > Windows Update.
3. Click View optional updates.
4. Expand Driver updates and then select the driver you want to update.
5. Click Download and install. Then, you should wait until the whole process ends.

After these steps, the issue should be solved. However, if you can’t find the View optional updates option, there should be no available graphics driver update. You can reinstall the graphics driver to see whether it can solve second monitor not detected or no signal.

Reinstall the Graphics Driver

1. Use Windows Search to search for device manager and select the first result to open it.
2. Expand Display adapters.
3. Tight-click the target adapter and then select Uninstall device.
4. Uncheck Delete the driver software from this device.
5. Click Uninstall.
6. Restart your computer and Windows will automatically install the graphics driver on the startup.
7. Access Device Manager
8. Right-click the computer name and then select Scan for hardware changes.

Rollback the Graphics Driver

If the 2nd monitor not detected issue happens after you update the graphics driver, you can rollback the driver to see whether the issue can be solved.

Bottom Line

We hope the solutions mentioned in this post can help you solve second monitor not detected.

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If you encounter some related issues, you can let us know in the comment.