It sounds like the cable box isn't doing a proper handshake to the HDCP (High Def Copy Protection). The television is not issuing that warning - the cable box is transmitting that warning.
The television is receiving the signal - but the box is not passing it through. The television MUST be HDCP compatible, as it's a standard set by the industry that we have to follow.
Hope that helps.
Just got this tv and LOVE IT!!!! Have an issue with my HD though and I am getting many confusing answers. I want to hook up my TV through my cable box (Scientific Atlanta Brand Explorer 8300HDC) using HDMI. But, when I hook the HDMI cable up to the cable box I get a message through the cable box which says:
CODE PROTECTION: DVI/HDMI outlet is blocked
Now my cable company(Time Warner) says that it is my TV. Which I can't understand because I have my progressive scan DVD player hooked up with HDMI and that works fine. They mentioned something about my TV not being HDCP compatable?? SOMEONE PLEASE HELP.....I hate watching HD through cheap component cables. Thanks