How to Hook Up Dual Computer Monitors
The average computer monitor is 15, 17, 19 or 21 inches diagonally. While sufficient for most tasks, there are times when a user would benefit from having more screen space. Having two monitors can give you the space you need; it can also allow you to work on two tasks simultaneously or have two processes running and viewable at the same time. The process of getting a second monitor attached to your computer is straightforward but will depend on the setup of your computer.
Check the computer ports on the back of the computer to make sure it supports a dual display setup. The computer must have either two blue video graphics array (VGA) ports, two white digital visual interface (DVI) ports, or one of each. Both types are trapezoid shaped and have small square (DVI) or round (VGA) holes.
Insert the second monitor's DVI or VGA cable into the free DVI or VGA port on the back of the computer. Plug the monitor into a power source as well. Turn it on by pressing the power button.
Open the Control Panel from the Start menu. Click "Appearance and Personalization," then "Adjust screen resolution."
Use the options under the multiple display tabs to adjust the layout of the two screens, extend the displays, make them mirror-images and more.