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If an HDMI-connected TV or monitor shows your wallpaper but not your open windows, your computer is most likely using an extended desktop. In that mode, the external screen is extra workspace, not a copy of your laptop screen. To show the same image on both displays, switch to Duplicate on Windows or turn on mirroring on a Mac.
Why does HDMI only show the desktop background?
A wallpaper on the external screen usually means it is receiving a desktop image. The windows may still be on your computer’s built-in display, or on another part of the extended workspace. Microsoft describes Extend mode as spreading the desktop across screens so items can be moved between them. That makes an extended desktop the first setting to check—not proof that the HDMI cable is faulty.
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On Windows, press Windows key + P to see the display modes. On a Mac, open Apple menu > System Settings > Displays and choose whether the display mirrors or extends the desktop. The available Mac controls can vary by model and display.
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Which display mode should you choose?
| Mode | What appears on the HDMI display | When to use it |
|---|---|---|
| Duplicate (Windows) or mirror (Mac) | The same picture as on the computer’s other display. | Use this to show your laptop screen on a TV or projector. |
| Extend | A separate area of desktop. Wallpaper may be visible even when no windows are on that screen. | Use this for extra workspace; move a window onto the external display. |
| Second screen only (Windows) | The computer uses the external display, rather than showing the desktop on both screens. | Use this when you want the TV or monitor to be the only active screen. |
Microsoft’s guide, How to use multiple monitors in Windows, explains that Duplicate shows the same content on all displays, while Extend lets you move items between screens.
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How to fix it in Windows
- Choose the intended mode: press Windows key + P, then select Duplicate to show the same image on both displays. If you want more workspace, select Extend instead.
- If you chose Extend, move the missing window: move it toward the edge of the computer screen in the direction of the external display. If you are unsure which side Windows expects, open Settings > System > Display and use Identify. Arrange the display rectangles to match where the screens sit physically.
- Make the HDMI display the only active screen if that is what you want: press Windows key + P and select Second screen only.
- If Windows does not detect the display: open Settings > System > Display > Multiple displays > Detect.
Microsoft’s multiple-monitor instructions cover Windows 10 and Windows 11. Microsoft notes that Windows 10 support ended on October 14, 2025.
How to mirror or extend the display on a Mac
- Open Apple menu > System Settings > Displays.
- Select the external display and use its Use as or arrangement controls to choose mirroring or an extended desktop. The exact choices depend on the Mac model and display.
- If the Mac does not recognize the connected display, hold the Option key in Displays settings to reveal Detect Displays, then select it.
See Apple’s Displays settings on Mac guide for the controls available on Mac.
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What to check if changing display mode does not help
If the screen remains blank, flickers, or is not detected after you select the mode you want, check the connection path before replacing anything. Microsoft’s external monitor troubleshooting guide recommends checking connections and isolating accessories and hardware.
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- Make sure the HDMI cable is firmly connected at both ends.
- Temporarily disconnect docks, dongles, or other accessories and connect the display directly if possible.
- Try another cable, then test the display with another system if available. These comparisons help identify whether the problem follows the cable, connection path, display, or computer.
A wallpaper that is merely too large or too small is a different symptom from missing windows. Microsoft documents a separate Windows wallpaper-fit issue when built-in and external displays have different resolutions: The wallpaper might not correctly fit the screen after connecting an external display in Windows.
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