If you encounter problems, try the possible solutions provided below.
Picture or Sound Issues
Don’t connect both the HDMI AV cable using the HDMI port and an AV cable using the AV port, such as the Xbox 360 Component HD AV Cable (sold separately). Connect only the optional audio adapter cable (included) for audio output while the HDMI AV Cable is connected.
No Picture
Turn on the TV. Select the video input on the TV (or VCR, if connected to a VCR) that displays the Xbox 360 game. Common names for video input include Input Select, AUX, Line In, Line, In, Input, Source, and EXT, depending on your TV or VCR type. For more information, see your TV or VCR manual.
Picture with No Sound
If you are setting up HDTV for the first time, verify that your TV supports the HDTV settings in the Xbox Dashboard. If you’re using standard left and right audio, make sure the audio connectors are connected to the appropriate input group on your amplifier or receiver. If you’re using digital audio, make sure your audio receiver is turned on and the audio output is correctly set in the Xbox Dashboard.
Sound with No Picture
Verify that the TV is turned on. If you’re using standard left and right audio, make sure the audio connectors are connected to the appropriate input group on your amplifier or receiver. Make sure the TV has been set to display the input group into which the HDMI AV cable is connected.
No High Definition Output
Make sure that the HDTV settings in the Xbox Dashboard are supported by your TV.