How to Add a Second Monitor to an iMac
On most versions of the iMac, you can add a second monitor. This will allow you to use the programs and documents already on your iMac but have a larger monitor. Also, some models of Apple computers allow "scanning," which means that a second monitor can be used at the same time but act like a completely separate screen, allowing you to view some applications on one monitor and do something completely different on the other monitor with just one computer.
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Instructions
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Purchase a second monitor that is VGA-compatible. Flat-screen monitors work well as second monitors because they take up less desk space than traditional monitors.
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Locate the VGA vented cover, which should have come as an accessory with your iMac. If a VGA vented cover was not included with your iMac, then it may not support an external second monitor.
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Remove the vent cover on the iMac. On many models, this will be located on the back. Replace the cover with the VGA vented cover, and connect the monitor cable from the new monitor to the VGA port.
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Attach a mini-dvi to component cable if the iMac does not support VGA connections. Connect the component end to the end of the monitor cable and the dvi (smaller end) to the dvi port on the iMac.
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Turn on the computer and the monitor. If you don't see any display on the new monitor, you may need to change the resolution under System Preferences > Displays.
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Change the mode of viewing, if possible, to allow for scanning and the use of each screen independently. Some newer versions of the iMac allow this. This can be set up, if available, under System Preferences > Displays. Older iMacs only support video mirroring, which means showing the same image on both screens.
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Tips & Warnings
Always try to enable scanning or extended desktop to allow you to view and access different files and programs on each screen from the same computer.
