Hack 120: Optimize Your Dual Monitors. Platform Windows. Studies show that the extra screen real estate afforded by multiple monitors can increase computer users’ productivity. 1 If you’ve added another monitor to your computer setup, you’ve got double the screen real estate to get things done — but are you putting all that space to good use?
If you have an iMac made in mid-2011 or later, then one thing you can do with it is to use it as an external monitor. Similar to Target Disk mode, where one Mac's internal hard drives can be. First, click on the Apple menu in the upper-left corner of the screen and select “System Preferences.” In System Preferences, click “Desktop & Screen Saver.” If you have more than one monitor attached to your Mac, a window will pop up on each one. Check out How you can connect Triple Monitors with Apple Mac Mini.Display Link Adapter: Link Store: Coo.
You can use an external display or projector with a Mac notebook while its built-in display is closed. This is known as closed-clamshell or closed-display mode.
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Check requirements
To use closed-display mode with your Mac notebook, here's what you need:
- An AC power adapter or an external display that provides power over USB-C or Thunderbolt 3 (USB-C).
- An external keyboard and mouse or trackpad, either USB or wireless.
- A USB-C to USB adapter or cable if you're using a USB mouse or keyboard with a Mac that has USB-C ports.
- An external display or projector.
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Enable closed-display mode
- Connect your USB keyboard or mouse to your Mac or external display, or pair your Bluetooth keyboard or mouse with your Mac. If you use a Bluetooth keyboard or mouse, choose Apple () menu > System Preferences, click Bluetooth, then verify Bluetooth is on.
- Connect your Mac to power with the AC power adapter. Some external displays, like the LG UltraFine 5K, also charge your Mac.
- Connect your external display or projector to the appropriate port on your Mac. Use an Apple video adapter if necessary. Some external displays have a USB cable that needs to be connected to your Mac.
- After your Mac notebook's desktop appears on the external display, close your computer's lid. You might have to press a key or click your mouse to wake the external display.
If your external display or projector doesn't turn on after you connect it to your Mac, connect your display while your Mac is asleep or off, then wake or turn on your Mac.
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Disconnect your display or projector
Before you disconnect your display or projector, put your Mac to sleep.
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Choose Apple () menu > Sleep, then disconnect your display or projector.