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[LG Laptop] Cannot connect a dual monitor in Windows 10. (HDMI

If there is an error in the graphics card, the screen goes blank when an external monitor is connected.

[LG Laptop] Cannot connect a dual monitor in Windows 10. (HDMI connection) LG USA help image
[LG Laptop] Cannot connect a dual monitor in Windows 10. (HDMI connection) LG USA help image 2
[LG Laptop] Cannot connect a dual monitor in Windows 10. (HDMI connection) LG USA help image 3
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TroubleshootingMonitors

What to Check First

  1. Video driver has an error.
  2. There is a problem in the laptop connection port and cable(HDMI).
  3. If there is an error in the graphics card, the screen goes blank when an external monitor is connected.
  4. ➔ If there is an error in the graphics card, the screen goes blank when an external monitor is connected.
  5. ① Right click with the mouse button on the [Start] button at the left to the screen or press the [Windows + X] keys on the keyboard to run device manager.
  6. ② In [Device Manager], double click the [Display Adapter] item.
  7. ③ After selecting the graphics device below [Display Adapter] and click the [X] icon at the top. ※ If the graphics device is not installed, then the display adapter is marked as “default Microsoft display adapter” or "standard VGA graphics adapter".
  8. ④ Do not put a check mark on the [Attempt to remove the driver for this device.] item but click the [Delete] button.
  9. ⑤ After you [Restart] the PC, check if the screen brightness is adjusted.
  10. ⑥ If the problem persists, check [Delete the driver software for this device] and restart the PC and then reinstall the graphics driver.

Why This Can Happen

Symptoms can have more than one cause, and the correct steps depend on the exact model, installation and operating conditions. Use the checks above to narrow the issue before service.

Safety and Model-Specific Guidance

Stop troubleshooting if you notice burning, electrical damage, unsafe heat, gas odor, refrigerant concerns, or water near electrical components. Follow the official LG USA instructions for your exact model.

Frequently Asked Questions

What should I check first for [LG Laptop] Cannot connect a dual monitor in Windows 10. (HDMI connection)?

Video driver has an error.

When should I stop troubleshooting and contact LG?

Stop if the product shows signs of electrical damage, burning, leaking near electrical components, or if the recommended checks do not resolve the issue. Use LG USA support for model-specific service guidance.

Does this guidance apply to every LG model?

Not always. Controls, error codes and service steps can differ by model. Confirm the exact model number and follow the linked LG USA article for model-specific instructions.

Related LG Products

These model pages are linked because the stored category or exact model matches this Help Library topic.

Buying Guides for This Product Type

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Read the Official LG Guide