

Hit the function key and then the corresponding "F" button to turn the port on. There's usually a symbol on one of the "F" keys resembling 2 boxes with a slash between them. Make sure the VGA port is turned on if you're using a VGA connection.Open the Apple menu > Displays > Arrangement, and uncheck the Mirror Displays box to use dual monitors. If your monitor doesn’t have the right input for your Mac, you will need to buy a special cable or adapter. X Expert Source Luigi OppidoĬomputer & Tech Specialist Expert Interview. Connect a monitor to your Mac using HDMI, Mini DisplayPort, USB-C, or Thunderbolt ports. HDMI cords create an instant digital connection.For any operating system before Monterey, try opening System Preferences, choosing Displays, then selecting Detect Displays (you may have to hold down the Option key for this button to appear). If your connecting cable and adapter are fully plugged in and you have checked your monitor’s input, but you still are not seeing your MacBook’s screen, your MacBook might not be detecting the monitor.You should be able to change your monitor’s input by pressing a button on the bottom or the side of the monitor, selecting Input, then selecting the option with the same name as the port you are using. If your monitor is not displaying your MacBook’s screen, be sure that you have selected the right video input.You should now see your MacBook’s screen on the monitor!

Plug the monitor into power and turn it on.
