To use two external monitors with the laptop lid closed, two things must be true:
- The laptop must support more than one external monitor.
- Closing the lid must not put the laptop to sleep.
Steps:
- Connect the monitors and confirm each one works.
- If only one external monitor works, the display adapter may not support more than one monitor.
- If the laptop has only one video output, a single external monitor is the default. To support more than one external monitor, use a docking station or, if the laptop has USB-C, a USB adapter that adds another video output.
- A display splitter will not extend to two monitors; it only duplicates the same signal.
- Set the display mode in Windows.
- Go to Start > Settings > System > Display.
- Under Multiple displays, choose Extend these displays if the two monitors should act as separate screens.
- If needed, use Windows key + P and make sure Extend is selected.
- Prevent the laptop from sleeping when the lid is closed.
- Press Windows + R, type powercfg.cpl, and press Enter.
- Select Choose what closing the lid does.
- For Plugged in, set When I close the lid to Do nothing.
- Save the changes.
- This keeps the external monitors active when the laptop is closed.
- If the second monitor is not detected:
- Disconnect docks, dongles, and adapters temporarily to rule out conflicts.
- Check that each cable is secure.
- Try a different cable.
- Try another video output port if the laptop has more than one.
- Press Windows logo key + Ctrl + Shift + B to reset the graphics driver.
- Restart the laptop.
- If the issue started after a driver update, open Device Manager > Display adapters > Properties > Driver > Roll Back Driver.
Important limitation:
- Some laptops support only two displays total at one time. In that case, the system may not be able to run the laptop screen plus two external monitors together. A supported workaround can be to disable the laptop screen and use only the two external monitors.
References:
- Troubleshoot external monitor connections in Windows
- Use Surface docking stations for Surface Pro 3 and earlier models
- Multiple monitors witha laptop - Microsoft Q&A
- Error message when you configure the display settings to try to use three or more displays on a laptop that is running Windows 7 and Windows 8: "Unable to save display settings"