Many common video problems, including no video, flickering video and low-quality images can be traced back to the connection between your Radeon HD 4850 X2 graphics card and your HDTV. Loose connections can cause the image to flicker or not appear. Verify that the video cable is firmly secured to your graphics card and your computer. If you are using an adapter or cable with thumbscrews, screw the thumbscrews on each end of the cable or the adapter firmly into place. Long cable lengths degrade signal quality. Use the shortest cable possible for the connection between your computer and your television. Low quality connections, such as S-video and component video, are incapable of transmitting high-resolution 720p video. To utilize your television's maximum ratio of 720p, use a HDMI, VGA, DVI or composite video connection. Finally, verify that your television is set to receive input from the connection that you used for your graphics card. Repeatedly press the "Input" button on your HDTV's remote or the HDTV itself to switch through your HDTV's inputs until your computer desktop is visible.
The ATI Radeon HD 4850 X2 contains two graphics processing units on a single card, allowing it to drive multiple displays or run graphically intensive programs and games. The card features four high-definition dual-link DVI outputs and a single standard-definition S-video output. These outputs, with the correct adapters and settings, provide a variety of ways to connect the card to a high definition television.
HDTVs with a rated resolution of 720p have a display area with 720 rows and 1280 columns of pixels. If your computer attempts to display video on the television at a higher resolution, the image will not appear. If it attempts to display video at a lower resolution with a different aspect ratio, the image may not appear or may appear distorted. When you start your computer with your HDTV on and turned to the correct input, you should see text on a black background during the boot process followed by the Windows logo. If you do not see any video after the Windows logo, your resolution may not be properly set. Power down your computer, connect a normal computer monitor to one of the DVI ports and restart your computer. Right-click on the computer's desktop and select "Screen Resolution." Select your HDTV from the "Display" drop-down box and then select "1280x720" from the resolution drop-down box and click "OK" to save your changes.
When properly configured, your Radeon HD 4850 X2 can send audio to your HDTV over the same HDMI cable that it uses for video. Some DVI-to-HDMI adapters do not support audio, so it is important to use an official ATI DVI-to-HDMI adapter, such as the one that is included with your graphics card. After connecting your computer to your HDTV through your graphics card, right-click on the speaker icon in your computer's system tray and select "Playback Devices." Select "ATI HDMI Output" and click "Set Default" to route your computer's audio through your television over the HDMI connection. Note that HDTVs will only accept audio and video from your computer over an HDMI connection. If you are not using an HDMI connection, you will need to run a separate audio cable from your computer's audio-out jack to your television's audio input jack.
Your computer communicates with your graphics card using a special type of software called a driver. If these drivers are not present, are not properly installed or are out of date, your graphics card may not display video or play audio properly. Download and install the latest drivers for your graphics card from AMD's website. After installing the drivers, restart your computer and check for functionality.
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