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Projectors will usually be identified on your computer as additional or optional screens/monitors. Depending on your setup (laptop/desktop) you may have some alt keyboard buttons with icons for single/multi screens. You will also likely have monitor control panels or non-windows equivalents. In Windows, for instance, right-clicking the desktop will usually bring up a monitor properties page. There you may be able to then select if the projector is a mirror of your desktop, an extension, projector only, or computer only.
Identifying available connections
The first step in connecting your computer to a TV or projector is finding an identical port on both machines. Once the matching port has been identified (one that is the same on both your input device and output device), you need the appropriate cable to connect them. This section contains a picture of the back of an Epson projector and its available connection ports; as well as descriptions of each.
The HDMI connection is very popular among display electronics. In fact, nearly all modern televisions and projectors feature HDMI ports. Most laptop computers support HDMI and it is becoming more prevalent on both desktop as well; even without a high-end video card. HDMI is quickly becoming the standard for all electronic equipment for its high quality signal and ability to carry both audio and video signals. The image to the right is that of an HDMI cable.
The VGA connection is the most common among both desktop and laptop computers, is found on most projectors, and some TVs. The VGA cable has a 15-pin connector on each end that plugs into a VGA port on each device. Due to the fact that most televisions do not support VGA, we recommend using HDMI for their wider range of compatibility.
Tip:VGA cabling is universal for devices that support it. For example, the if your desktop monitor that uses a VGA cable it, that same cable can be used by a laptop to connect it to a projector.
Note: If you are using an Apple desktop or laptop you need a VGA adapter to connect a VGA cable to the computer.
The DVI connection is newer than VGA and it offers a sharper image. Although the DVI port is not shown on the Epson model above, it is still somewhat common for projectors, not so much for televisions. It is mostly found among desktop computers for monitors, but some laptops have DVI connections as well (Apple laptops are more commonly known to support DVI than any other brand of laptop). Since finding DVI on a TV or projector is more difficult, we again recommend using HDMI cables.
Tip: There are special cables that convert from DVI to VGA or DVI to HDMI and vice versa.
The composite video connection is quite common on a TV or projector, but it is nearly nonexistent on modern computers. This connection is the yellow female cable on what is normally a three bundle of red, white, and yellow. The only time you should see this setup is on older video cards for desktop computers.
The S-Video connection is also commonly found on TVs and projectors, but solemnly on a desktop or laptop computer. This connection is a small step up from composite video, but is nearing obsolescence.
Connecting computer and projector or TV
After you've identified what connections are available on both your computer and TV or projector, you're ready to connect the cables. If the same connections are not available for both the computer and TV or projector, you'll need to purchase a video converter cable that converts one signal into a compatible signal.
For a desktop, you simply need to plug the cable into the computer and output device. If you don't see an image, you may need to change the display using the following steps.
Press the Windows Key.
Type Adjust screen resolution and press Enter.
Find Display and click the down arrow on the right-hand side of the box.
If you're connecting a laptop computer to a TV or a projector you'll often need to "send" the video signal to the display device. The key sequence to do this varies depending on the laptop; but usually it's either: Fn + F3, F4, F5, F8, or F9. For example, pressing and holding Fn + F3 at the same time on my laptop sends the video signal to my connected TV instead of the laptop's screen. The corresponding key used with Fn may be labeled as CRT/LCD or have a picture of a monitor on or close to the key. Additional help and information with switching the laptop display can also be found on the link below.
Switching TV inputs
Finally, if you're connecting a computer to a TV make sure it has been switched to the correct input. For example, if you connected an HDMI cable to your computer and the "HDMI 2" port on your TV, you'll need to switch to the "HDMI 2" input. This action can be accomplished by pressing the input button on your TV remote until the correct image is displayed.
You should be able to. It will somewhat depend on what video connections your PC has and what the projector will allow. If your desktop does not have the correct connections you can get a video card that should have what you need. Here is a link to video cards from a reputable dealer.
If you are attempting to connect an LCD projector to a laptop,you connect a monitor cable to your video card and the other end to the monitor input connector. You may have to use an adapter, I know on my LCD projector I had to use a DVI to VGA connector.
Can't say much more not knowing if you are having a problem with a particular brand of projector
please check the manual for the setup instructions also consult your notebook manual to look for the key stroke to extend the display to the projector.Ensure the little details like input mode and that the lens coveris removed etc. Also check this video for general instruction on connecting the projector to notebook (http://www.youtube.com/watch?v=R8UN761ODCo)
You need to change your graphics card settings from extended desktop to cloned desktop. You will find that if you use your mouse currently to drag a window or icon across to the projected screen, it will move the window there. This is the extended desktop. I assume that what you want is to have the exact same screen on your laptop and your projector - this is called the clone screen. These setting can be by right clicking your desktop, select properties. Click on the display settings tab. click on the advanced settings button, and the the graphics card tab. There should be another button to launch the graphics card settings there.