How to Add an Extra Monitor to an iMac
If you spend a lot of time with multiple windows open on your iMac or do a great deal of editing, you might find that one of the best ways to increase your productivity is to simply add an extra monitor. The extra monitor doesn't even have to be an Apple monitor, therefore significantly reducing your costs. Your second monitor can be used as a "mirror" (a monitor that displays the same screen as the computer's monitor), or it can be used to increase your screen space.
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Instructions
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Adding A Second Monitor
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While all of the newer models (post-2002) support dual monitors, some of the older models do not. Check with your computer documentation to find out if you can add a second monitor.
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With your Mac turned off, plug the second monitor into the appropriate video slot.
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Turn on your iMac and power up the second monitor. It will automatically recognize the monitor.
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Open "System Preferences" and click on the "Display" icon. You should have two display preferences showing up, side by side.
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Click on the "Arrangement" button; this will allow you to set up your two monitors. Drop-and-drag the monitors on the screen to reflect the physical set-up in your area. That way, when you move your mouse to the left, it will move towards the left monitor. You can also adjust the screen resolution for each screen at this time.
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If you want your monitors to "mirror" each other, click on the "Mirror Displays" button in the "Arrangement" screen.
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Using the "Options" function in your Displays window, you can set up the screen resolution for each of the two monitors. The higher the resolution, the more stress you'll put on the system. A lower resolution means a faster system, while a higher resolution provides more screen real estate.
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Close all windows, and your monitors should be set up.
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Tips & Warnings
"Mirror" monitors work best for showing presentations, while "independent" monitors are best used for editing and graphics work.
When you use an adapter, make sure that it is approved by Apple. Use of non-Apple supported products can lead to a voiding of the product warranty.
