Things You'll Need
Instructions
Turn off both the television and the Xbox 360. Disconnect any cables running from the console to the television.
Plug one end of the HDMI cable into the HDMI port located on the back of the Xbox 360.
Plug the other end of the HDMI cable into the HDMI port on the television.
Turn on the television and the Xbox 360. If the Xbox Dashboard is not visible on the screen, change the input settings on your television to the HDMI port. If the television has more than one HDMI port, switch the input settings until you find the right one.
Navigate to the System Settings menu on the Xbox 360. From there select "Console Settings," then "Display", then "HDTV." You can then choose the specific resolution of your television if it is not already selected.