Unable to Extend Desktop to a second monitor

So I recently bought a new monitor, I was previously operation of my TV.
But now I want to be able to extend the display to my desktop, so that when I watch tv programmes off the internet, I can just drag it over to my TV and sit back on the couch instead of having to sit in front of my monitor.

I go to screen resolution,  and it detects that both monitor are plugged in. The monitor (1920 x 1080) is plugged in with DVI, the TV (1280 x 720) with HDMI.
Both are plugged in through the GPU.

But when I click Extend The Desktop, and then try to save the changes an error message pops up telling me that it is unable to save these changes.
I'm not sure what the problem is, both monitors are plugged in, both work but I can't extend the display.

My GPU is a Gigabyte 6950, and it is updated to the latest drivers.

If anyone can help me solve this I'd be very grateful.



Error message " Unable to save display settings" mainly indicates that you try to extend or duplicate the desktop to the external monitors.  I suspect that the issue occurs because the it remembers both configuration for your extended monitor and TV.  To extend your monitor, you need to clear the multiple configurations for your computer and then extend your display by changing your display settings. To do this, please take the following steps:


The manual troubleshooting steps in the above link tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs.

For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: 



Delete registry key.


a.      Press Win + R to open a run box.

b.      In the Run box, type regedit, and then click OK.

c.     Locate the following registry subkey:

d.     HKEY_CURRENT_USER\Software\Microsoft\MobilePC\TMM

e.     Right-click the subkey, then, click Delete.

f.      When you are prompted to confirm the delete operation, click Yes.

g.     On the File menu, click Exit to exit Registry Editor.

h.     Log off the computer. Then, log on to the computer.


Extend your display by changing display settings.
a. Open Screen Resolution by clicking the Start button , clicking Control Panel, and then, under Appearance and Personalization, clicking Adjust screen resolution.
b. Click the drop-down list next to Multiple displays, click Extend these displays, and then click OK.


Refer these articles for more information.
Move windows between multiple monitors

Work and play better with multiple monitors


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Question Info

Last updated September 24, 2021 Views 91,921 Applies to: