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.
X Expert Source Luigi OppidoĬomputer & Tech Specialist Expert Interview. 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).
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. You should now see your MacBook’s screen on the monitor! Now take a look at the iMac's screen: Sure enough, there's the MacBook's hard drive icon on. Plug the monitor into power and turn it on. The one you need has the same large connector on both ends.
