How to Set Up a Dual Display
Add another display to your PC to make the most of your workspace. If your computer has an extra video connection port, you can add another monitor for a dual display. Let the video port type decide what kind of video connection cable you need. For example, if you want to set up a second display using your computer's DVI port, you'll need a DVI cable to connect the two devices.
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Instructions
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Insert the video cable into the extra video port on your PC.
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Plug the other end of the video cable into the monitor you are adding to your setup. Power on the monitor.
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Turn on your PC. Windows will automatically detect your dual display setup.
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Click the "Start" button on your task bar and open the "Control Panel."
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Select "Appearance and Personalization," then click the "Adjust Screen Resolution" link. A new page will open.
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Click the "Multiple Display" drop-down arrow. Select "Extend These Displays" to use your dual monitors as one large display. Select "Duplicate These Displays" to have your displays show the same desktop.
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