Ensure your laptop is selected from the touch screen or push button controller, and adapter/cable connections are secure (HDMI or VGA).

  • Choose Apple menu > System Preferences, click Displays, then click Display. Open the Display pane for me.
  • Click Arrangement, then select Mirror Displays to DUPLICATE laptop and projector output.  Or de-select Mirror Displays to extend displays (two outputs for laptop and projector).
  • Adjust resolutions as needed for best quality output.

Shortcut key to accomplish this:  Command + F1