It's a computer monitor-shaped icon in the Settings window. Cookies make wikiHow better. Click Keep settings when prompted. Show less Don't connect more than two displays to any bus. Check the second monitor's connection type. How to connect an external monitor to your iMac.
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How to set up multiple monitors with your Mac
Supported Display Configurations Apple: Depending on your computer's graphics card and motherboard, you may not be able to run a second monitor at the same time as your first. Top, bottom, right, left - it doesn't matter. Did you know you can use it as a second monitor for a MacBook? Published Date: If you already have a monitor you want to connect with your iMac, your first step is going to be determining which type of connector your monitor requires. I've been using a secondary monitor for nearly two years now, and I couldn't imagine a better setup for what I need.