i cant activate a second screen or monitor

Paul Davies 0 Reputation points
2026-10-21T04:08:03.2833333+00:00

i had connected a monitor to my PC which was working well but then after the automatic update few days ago the monitor stopped working

Windows for home | Windows 11 | Display and graphics
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  1. GsN5034 - IA 80,095 Reputation points Independent Advisor
    2026-10-21T05:27:18.9633333+00:00

    Hello,

    1. Have you checked the display cable or tested the monitor with another device?

    This will help determine whether the problem is with the display cable or the monitor itself.

    If you are using an HDMI cable to connect your laptop to the monitor, check whether the cable is faulty. Try a known working cable. Once plugged in, press Windows + P, and then select Duplicate or Extend to see whether the screen appears on the monitor.

    If the monitor is still not detected,

    Update the graphics drivers.

    1. Go to Device Manager.
    2. Expand the arrow next to Display adapters.
    3. Right-click your dedicated graphics driver, such as Nvidia or AMD, and select Update driver > Search automatically for available drivers. This will redirect you to the Windows Update page; see if you have an update for graphics drivers under the Optional updates section.

    If Windows cannot find any updated drivers,

    Visit your PC manufacturer’s website or the graphics card manufacturer’s website. Download and install the latest driver for your device model, then check whether the second monitor is detected.

    Let me know if you still need more help.

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  2. AI answer

    2026-10-21T04:08:54.8866667+00:00

    Press Windows key + P and select Extend; if the second monitor remains unavailable, isolate the connection and roll back the display driver installed around the recent update.

    1. Re-enable the second display

    1. Turn on the monitor and select its correct input source, such as HDMI or DisplayPort, using the monitor’s controls.
    2. Press Windows key + P.
    3. Select Extend. If necessary, try Duplicate once and then return to Extend.
    4. Press Windows key + Ctrl + Shift + B to reset the graphics driver. The screen may blink and Windows may play a sound.

    Microsoft recommends these projection and driver-reset steps when a previously working external display stops functioning.^1^

    2. Isolate the monitor connection

    Shut down the PC, then:

    1. Disconnect docks, USB hubs, adapters, and other unnecessary accessories.
    2. Connect the monitor directly to the PC if possible.
    3. Reseat the cable at both ends.
    4. Test a different cable or another video-output port.
    5. If available, connect the monitor to another computer.

    If it works on another computer, focus on the PC’s driver or output port. If it also fails there, the monitor, input selection, or cable is the likely area to investigate.^1^

    3. Roll back the display driver

    Because the problem began after an update, restore the previous graphics driver:

    1. Right-click Start and select Device Manager.
    2. Expand Display adapters.
    3. Right-click the Intel, AMD, or NVIDIA adapter and select Properties.
    4. Open the Driver tab.
    5. Select Roll Back Driver, complete the prompts, and restart the PC.
    6. After restarting, press Windows key + P and select Extend again.

    Administrator permission is required. If Roll Back Driver is unavailable, Windows does not have an earlier driver package stored; proceed to reinstall instead.^2^

    4. If rollback is unavailable, reinstall the driver

    1. Return to Device Manager > Display adapters.
    2. Right-click the display adapter and select Uninstall device.
    3. Select Attempt to remove the driver for this device, then select Uninstall.
    4. Restart the PC.
    5. Open Device Manager again.
    6. Right-click the display adapter and select Update driver > Search automatically for drivers.

    Windows will attempt to reinstall the display driver after restarting.^3^

    If Device Manager identifies an NVIDIA adapter and the PC was upgraded to Windows 11 24H2 or later, install the current driver supplied for the PC or graphics card. Microsoft has documented loss-of-display compatibility issues with certain NVIDIA driver versions on those Windows releases.^4^

    If none of these steps restores the monitor, open Feedback Hub with Windows key + F and include the Windows version, update number from Settings > Windows Update > Update history, graphics-adapter name, and connection type.

    References

    1. Troubleshoot external monitor connections in Windows
    2. [Windows 11](https://support.microsoft.com/windows/hardware/display-graphics/troubleshoot-screen-flickering-in-windows#fix-your-display-driver)
    3. Troubleshoot external monitor connections in Windows | Microsoft Support
    4. Guidance for updating to Windows 11, version 24H2 on devices with certain Nvidia display adapters
    AI-generated content may be incorrect. Read our transparency notes for more information.

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