The first thing you should do is adjust the HDMI display settings in the Dashboard. When using an HDMI, set the HDTV setting to Optimal Resolution.
This issue may also be caused by not connecting the HDMI directly to your TV. If the Xbox 360 is connected to a switching device (AV switch, receiver, ect.) bypass the device and connect the console to directly to the TV.
Your HDTV may have an image-enhancement feature or any kind of digital noise-reduction feature, this may have to be turned off.
A good rule of thumb is to connect your Xbox 360 console repairs to the Internet and obtain any available automatic Dashboard updates from the Xbox LIVE service.
If you are still having an issue with HDMI try another method to connect to your HDTV. One way is to use your Xbox 360 Component HD AV Cable.
If all else fails and troubleshooting does not correct the issues, you can count on www.videogame911.com to repair your system and return it back to working order. Just fill out a repair request on the homepage of www.videogame911.com for service on your system.
