So to fix the problem, you can try to disable and enable the graphics card device. Some users have confirmed that re-enabling the graphics card device can fix the problem. If this method doesn’t work for you, move on and try other methods. If neither of them is selected, select one of them depending on your need, then check if the second monitor is detected.
Second screen Only - Only using the second monitorĢ) Ensure Duplicate or Extend is selected. Extend - Using both monitors to display an extended desktop. Duplicate - Displaying the same content on both monitors. PC screen only - Only using the first monitor. The difference between each display mode is as follows: To manually add the second monitor, just follow these steps:ġ) On your keyboard, press Win+P (the Windows logo key and the P key) at the same time to invoke the PROJECT menu which contains four display modes. If that’s the case, adding the second monitor manually can fix the problem. When the second monitor is not detected, it’s possible that the second monitor is not added properly. To do so:ġ) Unplug the second monitor from the computer.ģ) Plug the monitor to the computer again.Ĥ) Turn on your computer and check to see if the second monitor is detected. To fix the problem, you can unplug the second monitor and restart the computer. If your second monitor is not connected firmly, the problem can cause. Method 5: Uninstall and update the graphics card driver Method 4: Roll back the graphics card driver Method 3: Disable and enable the graphics card device Method 2: Manually add the second monitor Method 1: Unplug the second monitor and restart the computer 
You can try them one by one until the problem is resolved. I’ve included six methods below to fix the ‘Windows 10 not detecting second monitor’ issue.
You can fix it easily with one of the methods below. Many Windows 10 users have reported this issue. If Windows 10 can’t detect your second monitor, not to worry.
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