Outputting video played on your computer is ideal if you want to show that video to a large group of people at the same time. Additionally, you can mirror your computer's display to show the video on both your computer monitor and the projector. This is useful if you need to monitor the video on your computer while sitting far away from the projector, or if you don't have a good view of the screen to keep an eye on the presentation. Connecting your computer to a projector and setting the monitor's display to be mirrored via the projector can be done in a few minutes.
Plug one end of a video cable into an available video out port on your desktop computer or laptop. Common video-out port types are VGA, HDMI and DVI. Laptop computers all have some type of video output port to complement the device's built-in monitor, but if your desktop computer doesn't have a second video output port, you'll need to connect a splitter to the lone video output port and then connect the video cable for your regular monitor and the video cable you want to use to connect the computer to the projector to the splitter. However, using a splitter reduces the quality of the output video.
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Plug the connector on the other end of the video cable into the corresponding input on the projector.
Turn on both the projector and your computer if they aren't turned on already.
Press "Win-P" to open a dialog box that gives you options for how to use the connected external monitor. The options include Computer Only, Extend, Duplicate and Projector Only. Alternatively, if you used a splitter to split the lone video out port on your computer, your image will automatically be duplicated on both your computer monitor and the projector screen, and you won't need to press the keyboard shortcut to set it up.
Select "Duplicate." Your computer's display will automatically be duplicated on both your computer's monitor and the projector's screen, and any video you view on your computer monitor also appears on the projector screen.