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You can make all of your displays mirror each other, or extend your workspace with different apps and windows on each display. If you use an external display with your Mac notebook, you can also use closed-display mode.

Check your requirements

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Check the ports on your Mac to find out whether you need an adapter.
Check how many displays your Mac supports: Choose Apple menu  > About This Mac, click Support, then click Specifications. On the webpage that appears, the number of displays your Mac supports appears under Video Support.

Use extended desktop mode

Maximize your workspace with extended desktop mode, which lets you enjoy full-screen apps and windows on each monitor. Then, use Mission Control to organize apps and windows across your displays. If your Dock is on the bottom of your screen, it appears on any of your displays when you move your pointer to the bottom edge of your display.

Turn on extended desktop mode

Make sure that your external display is turned on and connected to your Mac.
Choose Apple menu  > System Preferences, then click Displays.
Click the Arrangement tab.
Make sure that the Mirror Displays checkbox isn’t selected.

Arrange your displays or change your primary display

So that you can move apps and windows across your displays in one continuous motion, arrange your displays to match the setup on your desk. You can also change your primary display, which is where your desktop icons and app windows first appear.

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

Use video mirroring

With video mirroring, all of your displays show the same apps and windows.

Turn on video mirroring

Make sure that your external display is turned on and connected to your Mac.
Choose Apple menu  > System Preferences, click Displays, then click the Arrangement tab.
Make sure that the Mirror Displays checkbox is selected.

Use AirPlay

With Apple TV, you can mirror the entire display of your Mac to your TV, or use your TV as a separate display. To turn on AirPlay, follow these steps:

Make sure that your TV is turned on.
Choose in the menu bar, then choose your Apple TV. If an AirPlay passcode appears on your TV screen, enter the passcode on your Mac.
Mirror your display or use your TV as a separate display:
- To mirror your display, choose , then choose Mirror Built-in Display.
- To use your TV as a separate display, choose , then choose Use As Separate Display.
To turn off AirPlay, choose , then choose Turn AirPlay Off.

If you don't see in the menu bar, choose Apple menu  > System Preferences, click Displays, then select the 'Show mirroring options in the menu bar when available' checkbox.

Learn more about how to AirPlay video from your Mac.

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Before you begin

You can resolve many display issues by updating the software on your Apple devices, cables, and adapters. If you can see an image on your screen, check for software updates using the Mac App Store:

Connect your external display and any Apple video cables or adapters that you use with it.
From the Apple menu, choose App Store.
Click the Updates button in the App Store window.
Install any macOS or firmware updates that are listed.

If you're using a display, hub, extender, or adapter not made by Apple, check with the manufacturer for any updates that might be available.

If you're trying to connect a 4K display or Ultra HD TV with your Mac, make sure your computer meets the requirements for using these external displays.

If your software and firmware are up to date, or if you can't see the image on your screen, try the steps below for your specific issue.

If the display image is blank or unusable

Try these steps if you don't see an image on your display. These steps can also help if the image on your screen repeatedly turns on and off (flickers), if horizontal lines appear (snow), or if the image is distorted (torn or scrambled).

These steps likely won't help if the issue is only happening in one app. If you see similar issues in only one window or app, check with the app's developer for updates or more help.

Check connections

Check the connections to your Mac and external displays:

If you're using an Apple notebook, try connecting its power adapter.
Make sure the external display's power cable is securely connected and that your display is turned on.
If you're using a Mac Pro (Late 2013) make sure your displays are connected to the right ports.
If you're using a display hub, switchbox, or 'KVM,' try connecting your display's video cable directly to your Mac instead.
Disconnect the video cable where it plugs into your Mac, then plug it back in to reseat the connection.
If you're using a video adapter, unplug the video adapter from your Mac, then plug it back in to reseat the connection.
If you're using more than one video adapter to connect your display (the adapters are 'chained' together), try connecting the display using only one adapter if possible. Some video adapters can't be connected together. For example, a mini DisplayPort to DVI adapter can't be connected to a DVI to HDMI adapter.
If your display has more than one video connection, see if using another connection on the display works. If possible, check to see if using a different display or a different adapter works.
Try using a different cable that you know is in working order. Check with the display's manufacturer to make sure you're using the cable they recommend.
Restart the Mac with the display connected.

Detect your display

If you're using an external display, sleep and wake your Mac to make it check for connected displays:

Press the power button on your computer to put it to sleep, or choose Apple menu > Sleep.
Wait a few moments, then press a key on your keyboard or click your mouse or trackpad to wake your Mac.

If you're using more than one display, and you can see the image on one of the displays, you can also use Displays preferences to check for connected displays.

Adjust video settings

If there's no image on your display, try adjusting your display's brightness or contrast. If there's still no image, or the image appears torn or scrambled, try selecting a different video resolution in System Preferences.

Adjust brightness

If you're using an Apple Display, press the increase brightness key on your Apple keyboard. To adjust the brightness of a secondary display, press Control-F2.
If you're using a display that's not made by Apple, check the documentation that came with your display to see if it includes built-in controls for adjusting its brightness or contrast.

Change your display resolution

From the Apple menu, choose System Preferences.
Click the Displays icon.
Click Default for display. If you see more than one resolution listed, choose a resolution and refresh rate. If the display turns off when you change resolutions, press the escape key to undo the change.

If you can't change the resolution of your display because you can't see an image, restart your Mac in safe mode to reset the display resolution to defaults.

If starting in safe mode doesn't resolve the issue, reset your Mac's NVRAM and SMC to reset the video ports on your Mac to their defaults.

Check for third-party display software

If your display works only when your Mac is started in safe mode, and you have display-related software installed, check with the software's developer for updates, or

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