Onkyo TX-SR605 Receiver "green distortion hd tv" Questions

...distortion while watching cable. Picture flicker on all or part of the screen, especially when there is a cut between scenes on the program I'm watching. On occasion, the picture has even disappeared ...

...HD channels. Cox Communications is my service provider. Any help/incite will be apprecated. Believe that is a problem with either the reciever or cable box. thanks, Rob This is a cable box problem. ...