You might check to see if the game console is outputting at a 480p or higher resolution. In some cases, the 480i resolution from the game consoles may present an incompatibility in signal resolution.

If you have another TV available, connect it and change the output resolution to a higher resolution, and then reconnect it to the television.

You might also change the name of the input from "----" to "GAME" under the INPUT Menu, in the Edit Input Name selection.