For those who own an iMac, there comes a point when you need to use an display. Maybe you need to share your screen with a colleague, or simply want to enjoy a larger display. Fortunately, thanks to Apple’s Target Display mode, you can use your iMac as an external .

This feature is available for all iMac models released in 2009 or later, except the 27-inch 2014 Retina iMac. Here’s how to use an iMac as an external monitor.

First, check compatibility

Before setting up Target Display mode, you should make sure your iMac supports the feature. It should be running OS X 10.6.1 or later, and have a Mini DisplayPort or Thunderbolt port. The cable you use must be a Mini DisplayPort or Thunderbolt cable.

Start by powering on both computers. Connect the Mini DisplayPort or Thunderbolt cable from the iMac’s port to the Mac you want to use as the primary desktop. If the cable isn’t already plugged into the iMac, leave it unplugged as you start up the computer.

Enable Target Display mode

To start, make sure that your iMac is booted up and logged in. Then, press CMD + F2 on the keyboard of the iMac you want to use as a display. This will activate Target Display mode.

If you’re not using an Apple keyboard or the shortcut doesn’t work, you can enable Target Display mode via the Displays option in System Preferences. Choose the arrangement tab, which will appear once your iMac is detected. You’ll see an option to “Mirror Displays,” and below that, “Use As A Separate Display.” Select this option to enable Target Display mode.

Using the iMac as an external monitor

Once Target Display mode is activated, the iMac will display the desktop of the connected Mac. The iMac keyboard and mouse will become inactive and any input or tasks will need to be done using the connected Mac.

To exit Target Display mode, simply press the CMD + F2 on the iMac’s keyboard again. Alternatively, go back into the Displays preference pane and unselect “Use As Separate Display.”

Final thoughts

Using an iMac as an external monitor can be a great way to expand viewing. It’s also a great solution if your iMac is still valuable and you want to continue to use it but want to add another monitor for work.

Target Display mode is a great feature that Apple’s added on many of its Macs to help connect to other devices. It’s easy to set up and easy to use, and the result is a great extended, optimized screen for whatever you’re working on. So, go ahead and enjoy the benefits of a dual-screen setup.

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