Windows 10 will not detect second monitor and just mirrors the display

Hi

My son has a gaming pc with a new NVidia video card and running Windows 10 I believe and we have just purchased an ultra wide gaming monitor for his birthday.

He wishes to keep his AOC existing monitor and have 2 monitors up and running and to extend the display and not mirror.

We have connected both via HDMI using I think the term is a HDMI splitter purchased from Amazon.

We have updated the Nvidia drivers as suggested and ensured all the cables are connected but when we go to Settings and additional display it does not detect the second monitor and the display is mirrored with no option to extend.

Searched on the web for half a day with no real suggestions.  I use 2 monitors at work without issue so cannot explain to him why it will not detect the 2nd display.

Any help would be greatly appreciated. Thanks. 

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Answer
Answer
Hi Robert

If you use a splitter cable, the only option you will get is Duplicate screens, since the same signal will be fed to both screens

You need to have a graphics card with 2 separate outputs to be able to extend your desktop and have basically 2 different desktops

What is the Make and exact Model No. of the Gaming PC - that will be printed on a sticker on the bottom casing . . .
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Power to the Developer!

MSI GV72 - 17.3", i7-8750H (Hex Core), 32GB DDR4, 4GB GeForce GTX 1050 Ti, 256GB NVMe M2, 2TB HDD

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Answer
Answer
Hi Robert

My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.

Its possible there might be an issue with your adapter or cable connection. You could try nudging the cable to see if it works or change out the cable.

Press Windows key + X
Click Device Manager
Expand Monitors

Right click the monitor that keeps freezing
Click uninstall

Restart your computer then check if its working again properly.

You can also try lowering the screen resolution of the second monitor to see if that works.

Still not working....

ress Windows key + X
Click Device Manager
Expand Display adapters
Right click the current display adapter
Click Properties
Click Driver tab
Click Rollback driver if the option is available

If not
Right click the current display adapter
Click Uninstall
Check the box that says, "Delete the driver software for this device.”
Exit Device Manager
Restart

Click Start > Settings > Update & security > Windows Update > Check for updates
Download and install any pending updates
Restart your computer

Press Windows key + P
Click PC Screen only

Disconnect the external monitor.

Restart.

Connect the second monitor.

Press Windows key + P
Click Extend

See if it starts working again.

If not, make sure the latest Windows Updates are installed.
Best regards,
Andre Da Costa
Independent Advisor for Directly

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Last updated September 16, 2021 Views 43,560 Applies to: