Not all Screens are Detected

Problem

My computer is only detecting screens 1 & 2. I am clicling detect and it cannot detect anymore screens.

Right click on your desktop.
Click on Display Settings.
Under the screen display, click on Identify. This will help you locate what screen is where. It will display the number of the screen on each lower right corner screen.
Click on the screen icon that shows to screens (see the icon highlighted below).
Make sure to select Extend desktop to this display (see highlight below).
On some occasions, the Extend option is not one of the options. Press the Windows Key + P and it will be located to the right of the screen
Once you identify where the screens are located, make sure that you arrange them by clicking and dragging the screens under Customize your display in the correct order.
Then, click Apply at the bottom of the screen.