Working on a two display computer setup helps multitask more efficiently. Graphics artists, internet workers and designers prefer this to minimizing a window or using alt-tab too often to switch programs. However, there are instances when an extension display connected to the computer quit working or is not detected.
Don’t panic. You can resolve the Windows 10 cannot detect second monitor problem in just a few steps.
The issue could either be hardware or software related. Though your first guess may be that your monitor is broken. But that’s not always the case.