If the external monitor is not automatically detected and displaying an image, you will need to use a function key to enable or activate the function. Computer manufacturers have different methods to activate an external monitor. Refer to the computer's user guide/manual or the manufacturer for instructions to activate the video port for the external devices.  


1. Right-click an empty area on your desktop, and then click Screen Resolution or Display Settings (Win10). 

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2. Click the Multiple Displays drop-down list, and then select Extend These Displays or Duplicate These Displays. 

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If you cannot see the additional monitor(s) listed, click Detect. If it does not work, try restarting your computer and repeat steps 1 and 2. 


Options for settings 

  1. Duplicate these displays: This setting will duplicate your computer screen image on both monitors based on the monitor with the lower resolution. 

  2. Extend these displays: This setting allows you to move a window from one monitor to the other by clicking the title bar of the window and dragging the window to a new location.

  3. Show desktop only on 1: This setting is typically chosen when a laptop is used as a desktop computer so you can enjoy the higher resolution of a large external monitor. 


    Note: Click Identify Monitors to see which monitor is number 1 and which is number 2; then drag the monitor icons to reorder their positions to match the physical setup you have chosen. 
     

MacOS 

Make sure that your external display is turned on and connected to your Mac. 

Turn on extended desktop mode 

  1. Select the Apple menu -> System Preferences, then click Displays. 
  2. Click the Arrangement tab. 
  3. Make sure that the Mirror Displays checkbox isn’t selected. 


 

 

Arrange your displays or change your primary display 


  1. Choose Apple menu  -> System Preferences, then click Displays. 
  2. Click the Arrangement tab. 
  3. To change the position of a display, drag it to the desired position. A red border appears around the display as it's moved. 
  4. To set a different display as the primary display, drag the menu bar to the other display. 

Turn on video mirroring 

  1. Choose Apple menu   -> System Preferences, then click Displays. 
  2. Click the Arrangement tab. 
  3. Make sure that the Mirror Displays checkbox is selected. 


 
 
***Note:  Regardless of what Operating system is being used, it’s recommended to check the OS support site for any updates.***