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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.
Make sure you have the TV's input set to PC or Computer to receive the signal from the VGA.
Make sure the connections are snug on the computer and on the tv.
Reboot the computer and see if it automatically starts the display on the tv. If not, there are a sequence of keys that you can press to toggle the display between the tv and the computer.
Normally to toggle the display you will have to Press and Hold the FN function key located at the bottom left portion of your keyboard and then hit the corresponding key (F1 thru F12) that toggles the display. The correct F1 thru F12 key to hit will have the CRT/LCD on it or it might have the icon of a display.
on your computer, go into your vga graphics driver and hit properties, set it for dual and hit apply. close the box. then go to the graphics,options, look for dual. make sure the wire is tightly in your tv and computer. switch your tv to vga. it should be lit. then you should see your desktop on your tv screen.
your computer must be set up to display images to another playback unit - i.e. tv. go into display proprerties and choose "another" video display. right now the laptop is only set to display to your laptop.
(i) You're using an appropriate cable to connect the TV to the Computer. (ii) The cable is connected to the out port on the Computer and the corresponding in-port on the TV. (iii) You've selected the correct input on the TV. (iv) Dual display is enabled on the Computer. (v) The resolution of the video signal being transmitted from the Computer to the TV should map the display resolution support by the TV. In this case, you may try lowering down the resolution of the TV in the Display Settings window of the Computer after selecting the second display.
Initially, pls try lowering the screen resolution of your PC. This can be done at the Display Properties/Settings tab and then move the slider of the Screen resolution towards the left, Apply OK. In some instances, you need to also lower down the Screen refresh rates in the Monitor tab of the Advanced Properties.
If your concern has not been corrected after completion of the above procedures, then other methods can be considered.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
The resolution setting on your pc must be in the acceptable range for the monitor to handle. Look in your tv owners guide to see the resolution range and make sure your pc is not over that range or it will not work. Good Luck