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Second monitor not detected (Or both monitors detected as a single device)

Anonymous
2021-05-27T13:58:48+00:00

I've just added a second monitor to my setup. It is the same model as my first monitor. Upon setup, the monitors were set to duplicate. I tried setting them to extend, but Windows does not detect a second monitor. I have restarted the computer, updated/uninstalled/reinstalled graphics driver, manually detected, Windows+P>extend, and nothing has worked. I find it odd that while picture displays without issue on both monitors, Windows only recognizes that one monitor is connected (Device manager only shows a single monitor).

I've also replicated this on a second computer, which is a laptop. On the laptop, I can set the display to "extend" but the external monitors are duplicated. So I effectively have three monitors (including the laptop screen) acting as two, with the identical external monitors displaying the same picture.

I don't know if this means Windows isn't detecting the second monitor, or if it's somehow treating both as a single device. I'm in over my head here, any suggestions I have yet to try would be appreciated.

Windows for home | Windows 10 | Devices and drivers

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  1. Anonymous
    2021-05-27T20:25:00+00:00

    Ok, if I understand correctly, you have 1 hdmi cable which is connected to the Matrix HDMI box in the IN port and 2 hdmi cable in the out on two screens ?

    If this is the case, an hdmi cable cannot transmit two different displays at the same time unfortunately.

    HDMI doesn't support multiple video streams on a single port, HDMI splitters will only duplicate displays.

    On the other hand, you can buy a USB to HDMI converter for really cheap on Amazon. ( Like the picture below )

    With this, you will be able to extend your desktop on your computer or laptop.

    5 people found this answer helpful.
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  2. Anonymous
    2021-05-27T15:43:32+00:00

    Hello Nick, my name is Marco and I am an Independent Advisor. I understand your problem, I will do my best to help you.

    Try this solutions.

    1- Right-click on Windows start button and select " Device Manager "

    • Right-click on the monitor driver and select 'update' and ' seach automatically for driver'

    2-Check your Windows updates

    -Right-click on Windows start button and select ' Settings '

    -Click on 'Update & Security'

    -Go in 'Windows Update' tab and 'check for update'

    3-Open Windows start menu and type ' Control Panel '

    -Click on 'Hardware and sound'

    -Click on 'Device and Printers

    -Right-Click on the monitor and select ' troubleshoot '

    Or, do you use a hdmi splitter ?

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  3. Anonymous
    2021-05-27T19:40:01+00:00

    Thanks for your reply:

    1 - "The best drivers for your device are already installed."

    2 - "You are up to date"

    3 - "Troubleshooting couldn't identify the problem"

    I'm using a 4x2 HDMI matrix for both monitors (which I have been using since before I added the second monitor). I have not had any issues up to this point with the matrix.

    1 person found this answer helpful.
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