Second monitor not detected

[ceaton8950]

My second monitor is not detected and only duplicates the main display. I've tried setting up both with HDMI and setting up one with HDMI and the other with VGA . When I set both with HDMI, I get a duplicate display; when I set up with HDMI and with VGA, the monitor hooked to the VGA port goes black. I've also tried uninstalling the display adapter for the graphics card, then right-clicking on Generic PnP monitor, then scanning for hardware changes. Nothing works. When I try to detect, I get the response: "We didn't find another display." There are no options for identifying monitors. Does anyone have any suggestions? Thanks in advance!

[Garp_senchau]

Hi @ceaton8950,

Welcome to HP Support Community,

Thank you for posting your query; I’m here to help by guiding you through steps to resolve this issue

Check Physical Connections

• Ensure both cables are properly connected: Double-check that both HDMI and VGA cables are securely plugged into both your monitor and your computer.
• Try different cables/ports: If you have spare cables or another monitor, test them to rule out a faulty cable or port.

Update Graphics Drivers

• Update the graphics driver: Go to Device Manager (press Win + X and choose Device Manager), expand the Display Adapters section, right-click your graphics card, and choose Update Driver.
• Alternatively, visit the manufacturer’s website (Intel, Nvidia, AMD) and download the latest drivers.

Use Display Settings

• Right-click on the desktop and select Display Settings.
• Scroll down to the Multiple Displays section. Ensure the Extend these displays option is selected, rather than Duplicate.
• Click Detect. If it still says "We didn’t find another display," try restarting your computer after this step.

Check Display Preferences in the GPU Control Panel

• If you have a dedicated graphics card, open the NVIDIA Control Panel (for NVIDIA cards) or AMD Radeon Settings (for AMD cards) and check display settings.
• Ensure the second display is enabled and properly configured. You may need to manually configure the second monitor to extend the desktop.

Force a Display Detection Using the Graphics Card's Software

• For NVIDIA: Open the NVIDIA Control Panel, click Set up multiple displays, and try to detect the second monitor from there.
• For AMD: Open the AMD Radeon Settings, go to Display, and click on Detect Displays.

Check Display Mode

• Windows+P: Press Windows + P to open the display mode options. Select Extend to try to extend the desktop to the second monitor.

[Garp_senchau]

Uninstall and Reinstall Display Drivers

• Uninstall Graphics Driver:
  1. Open Device Manager.
  2. Right-click on your graphics card under Display adapters.
  3. Click Uninstall Device.
  4. Restart your computer, and Windows should automatically reinstall the driver.

Check Monitor Settings

• Ensure that the second monitor is set to the correct input source. For example, if you're using VGA, the monitor should be set to receive VGA input.

Try Booting with Only the Second Monitor

• If the second monitor is still not detected, disconnect your primary monitor and leave the secondary monitor connected. Boot your computer to see if it gets detected. Sometimes, Windows will automatically detect and adjust the settings when only one display is connected.

BIOS/UEFI Settings

• Check BIOS/UEFI: Some systems have specific settings that may disable certain display outputs. Restart your computer and access the BIOS/UEFI settings. Look for anything related to Graphics Configuration or Multi-Display and ensure they are enabled.

Test the Second Monitor on Another PC

• To rule out a hardware issue with the second monitor itself, connect it to another computer to see if it works. If it doesn't, there may be an issue with the monitor.

I hope these steps help resolve the issue

Please feel free to reply here if you have any questions or if you need further clarification on any of the steps. 

Take care and have a good day. 

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