Mac App Display External Monitor
Before you begin
Mar 31, 2020 Quit any open apps that you want the eGPU to accelerate on the primary display. Choose Apple menu System Preferences. Select Displays, then select the Arrangement tab. Drag the white menu bar to the box that represents the display that's attached to the eGPU. Apr 24, 2020 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. Use an external display with your MacBook Pro The Thunderbolt 3 ports on your MacBook Pro support video output. You can use an external display, a projector, or an HDTV with your MacBook Pro. Connect a VGA display or projector: Use a USB-C VGA Multiport Adapter to connect the display to a Thunderbolt 3 (USB-C) port on your MacBook Pro. Aug 29, 2014 If you’ve got a huge external monitor and wish to dock it with a MacBook and attach Bluetooth keyboard and mouse instead of creating a multi-monitor setup, you’ll need to use the clamshell mode. Mar 16, 2020 Connecting Another Mac to Your iMac The 27-inch iMac has a bi-directional Mini DisplayPort or a Thunderbolt port (depending on the model) that can be used to drive a second monitor. The same Mini DisplayPort or Thunderbolt port can be used as a video input that allows your iMac to serve as a monitor for another Mac.
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 try temporarily uninstalling it.
If an image appears fuzzy or blurry
If images or text on your display appear pixelated or blurry, check these things.
Check your display resolution
Make sure your display resolution in System Preferences is set to its default. If you're using a resolution that's scaled, the image might be magnified to fit the display. This can cause the image to look blurry in some apps.
- From the Apple menu, choose System Preferences.
- Click the Displays icon.
- Select Default for display.
If you use a monitor or an HDTV connected with an HDMI cable, you might see a difference in video quality if your display is set to television mode. Check your display for a 'monitor mode' setting to get the best video quality.
Retina displays
If an app you're using appears low resolution on your Retina display, check to see if an update to the app is available. Most apps have been updated to use the higher pixel densities of Retina displays.
Lower-resolution images on some web pages might also appear 'softer' when viewed on a Retina display. This is because Retina displays have a higher pixel density and not all websites use Retina-ready images.
For example, the images below look different when viewed on a Retina display, but the same on a non-Retina display. This happens because the Retina-ready image has a higher pixel density:
If you see contrast or color issues
If your entire display image seems too dark or too bright, you can adjust the brightness and contrast from the Displays pane of System Preferences, or by using your display's built-in controls. Add pages to apps access microphone mac mojave.
Adjust brightness and contrast
To adjust the brightness of your Apple display, press the brightness key or F2 key on your keyboard. You can also use the brightness adjustment for each connected display in System Preferences > Displays.
Displays not made by Apple sometimes have brightness and color adjustments built into the display. Check the documentation for your display to see if it includes built-in controls.
When you connect a display, projector, or HDTV using an HDMI cable, you might see a difference in video quality if your display is set to television mode. Check your device for a 'monitor mode' setting to achieve the best video quality.
You can also calibrate each display from the Color tab of Displays preferences to get the best color and brightness from your display.
If you see bright or dark pixels
Mac App Display External Monitor In Mac
If individual pixels on your display seem too bright or too dark, see these articles for more help:
Connecting displays with Thunderbolt 3 (USB-C)
The Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter connects Mac models with Thunderbolt 3 (USB-C) ports to older devices that use Thunderbolt (10Gbps) or Thunderbolt 2 (20Gbps). For example, this is the adapter that you should use to connect your MacBook Pro to an Apple Thunderbolt Display or a third-party Thunderbolt 2 storage device.
This adapter doesn't support connections to Mini DisplayPort displays, including the following Apple adapters and displays:
- Apple Mini DisplayPort to Dual-Link DVI Adapter
- Apple Mini DisplayPort to DVI Adapter
- Apple Mini DisplayPort to VGA Adapter
- Apple LED Cinema Display
If you're using the Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter to connect to a compatible display and the display doesn't show an image, try unplugging the adapter and plugging it back in.
Get more help
If you've tried these steps and your display still isn't working, contact Apple Support to get more help.
Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
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
- 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.