Cable operators can push out updates when they feel like it. Be sure to try other HDMI sources to see if those work.
I have owned a Samsung LNT4669 since 2008 and it has been hooked up to the cable box with an HDMI cable with no issues.
The set has not been moved and the cable has not been touched. About a week ago, out of nowhere, when the set is turned on, a message appears on the screen informing me that: "The set's HDMI port requires an HDCP-compatible TV input" and says that I need to "switch to a compatible TV input or do not use the set's HDMI port". The error code is listed as HDCP-019.
The set was functioning fine before this happened for no apparent reason. The only way I can get a picture is by using the Samsung remote and pressing the "source" button twice each time I turn on the set --- so it does not seem like the cable is at fault, but perhaps a setting needs to be changed --- I just have no idea which one.
Thanks in advance for your help