Windows 10: My second monitor is not detecting but is mirroring my primary display

About 10 minutes ago, both of my monitors went black and I restarted my computer which fixed the issue until I logged in and saw that my second monitor was mirroring my first. I went to the display setting to find that only one of my monitors was being detected, yet they were both still displaying and I can't find any fixes online.

:)

 

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.

 

Second monitor not detected after update

Hi Tom,

There are several reasons that could have caused the issue you are experiencing. One of these is the update you previously performed in Windows, either it was not configured properly by the system or the update components were corrupted. Kindly answer the
following questions for clarification:

• Have you tried updating the monitor and display drivers?
• Have you tried to use another user profile to check if the issue re-occurs?

Furthermore, we suggest that you add the other monitor manually. This is to ensure that the second monitor is still connected after the update. Here are the steps:

• Type connected devices and open Connected Devices on the
  Windows Search bar.
• Click Add devices.
• Select the Second screen.
• Pick one of the 3 options: Duplicate, Extend, and the Second screen only.
• The Duplicate option will duplicate the primary display to secondary display.
• The Extend option will unite two monitors so you can use them both as one.
• The Second screen only option will, obviously, disable primary and use only the secondary monitor.
• Once you’ve chosen the preferred mode, save changes.

We're looking forward to your response.

 

Windows 10 detecting primary monitor only when second monitor unplugged

Whenever i plug in my second monitor it only detects the second monitor despite my primary monitor being plugged in, if i then unplug my second monitor it detects both monitors despite only having the primary one plugged in, any idea what is happening?