Display mode will not show my 2nd Monitor to Extend

Gary Seals 0 Reputation points
2026-09-03T00:52:21.7833333+00:00

I am trying to use a 2nd monitor to extend the display on my PC. When hit Windows button plus P, my PC will not accept the extend selection.

we I right click then go to display duplicate/extend monitors nothing shows up for me to extend.

I just bought an HDTV splitter to hook my monitors up to my Dell PC, could it be the problem?

Windows for home | Windows 11 | Display and graphics
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  1. AI answer

    2026-09-03T00:52:40.1066667+00:00

    Yes. An HDTV splitter is likely the problem if the goal is to extend across two monitors.

    A splitter duplicates the same video signal instead of creating two independent displays, so Windows may not offer Extend for the second screen.

    Try this:

    1. Test with only one external monitor connected directly to the PC.
      • Press Windows key + P and select Extend.
      • If one monitor works, the issue is likely how the second monitor is connected.
    2. Remove the HDTV splitter.
      • A splitter is for mirroring/duplicating, not extending.
    3. Check how many video outputs the Dell PC has.
      • If the PC has only one video output port, it normally supports only one external monitor by default.
      • To use more than one external monitor, a docking station or, if the device has USB-C, a USB adapter may be needed.
    4. If even one monitor does not extend correctly, try basic monitor troubleshooting:
      • Make sure Extend is selected with Windows key + P.
      • Disconnect accessories such as docks, dongles, and adapters.
      • Reseat the display cable.
      • Try a different cable.
      • Try a different video output port on the PC, if available.
    5. If the setup worked before and then stopped, try resetting the graphics driver:
      • Press Windows key + Ctrl + Shift + B.
      • If needed, restart the PC.
    6. If using more than one external monitor still fails after removing the splitter, the display adapter may not support multiple monitors. In that case, check the PC or graphics adapter manufacturer’s specifications.

    References:

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  2. EmilyS726 264.5K Reputation points Independent Advisor
    2026-09-03T01:36:02.6966667+00:00

    Hello

    Yes, splitter is the problem here, because it is splitting the same video signal, hence you get same output for both displays.

    You need something more like a docking station with dual outputs in order to have extend option, basically the output needs to be two separate video signals.

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