My HP laptop suddenly is no longer detecting my addtional external monitor

Stuart Friedman 0 Reputation points
2026-09-18T19:19:30.0566667+00:00

My HP laptop suddenly is no longer detecting my addtional external monitor which is connected by a cable? Nothing seems to work to resolve it.

Windows for home | Windows 11 | Devices and drivers
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  1. Ivan B 124.5K Reputation points Independent Advisor
    2026-09-18T19:55:54.5066667+00:00

    Hi,

    If the Q&A procedure didn't work, please follow the procedure below.

    Search for msinfo32.exe in the search bar, take a screenshot, and post it here so we can see the correct laptop model or desktop configuration.

    Thanks

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  2. AI answer

    2026-09-18T19:19:46.0133333+00:00

    Try this order, starting with the quickest checks:

    1. Press Windows logo key + P and make sure Extend is selected.
    2. Disconnect all accessories from the laptop, including docks, dongles, and adapters, because they can cause conflicts.
    3. Check that the monitor cable is firmly connected on both ends.
    4. Try a different cable. If the new cable works, the original cable was faulty.
    5. Test the monitor with another system to confirm whether the issue is with the monitor or the laptop.
    6. If the laptop has more than one video output port, connect the monitor to a different port.

    If the setup worked before and then suddenly stopped:

    1. Press Windows logo key + Ctrl + Shift + B to reset the graphics driver.
    2. Restart the laptop: Start > Power > Restart.
    3. If restart does not help, use Start > Power > Shut down, then turn it back on.

    If the problem started after an update, try the display driver steps:

    1. In the taskbar search box, type Device Manager.
    2. Open Device Manager and expand Display adapters.
    3. Right-click the display adapter, select Properties, open the Driver tab, and select Roll Back Driver if available.
    4. If Roll Back Driver is not available, reinstall the display driver:
      • In Device Manager > Display adapters, right-click the adapter and select Uninstall device.
      • Select Attempt to remove the driver for this device, then select Uninstall.
      • Restart if prompted.
      • Open Device Manager again, right-click the display adapter, select Update driver, then select Search automatically for updated driver software.

    If the monitor is connected through USB-C, also check these points:

    • Make sure the PC, external display, and cable all support the required display alternate mode such as DisplayPort, MHL, or HDMI.
    • Connect the display or dongle directly to the laptop instead of through an external hub or dock.
    • Make sure it is plugged into the correct USB-C port that supports the needed alternate mode.

    If none of these steps works, file the issue in Feedback Hub and include the steps that reproduce the problem.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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