Torgeek
Why is 2nd monitor not being detected?
A buggy, outdated, or corrupted graphics driver can cause problems that may prevent Windows 10 from detecting a second monitor automatically. The easiest method to fix this issue is updating, reinstalling, or downgrading the driver.
Why is my second screen duplicating?
In Mirror Mode the computer monitor duplicates the monitor on the external display so that you see the same picture on both the desktop and projector. In Extend Mode the external display is treated as a separate screen so that you can have a different windows open on the projector and desktop.
