Hi everyone. I have an HD receiver/DVR from Comcast. I bought the Red/Blue/Green video cables and connected them to the DTV ports on the back of the TV and connected them to the receiver. I changed the input on the TV to DTV and the picture is green. I just had the TV looked at to have the guns calibrated and everything else is good to go. Is there a setting or something I'm missing? Thanks in advance for any help.