...avsforum.com. They will be able to give you the granular level assistance you require.
I have time warner 8300HDC cable box hooked to a Sharp LC46E77UN and kept getting the Copy Protection warning. After several calls(no help at all) to tw and changing HDMI cables, I finally exchanged the converter box and everything works great. When I called tw the only solution I could get from them was to download and install a firmware update from Sharp! The warning stated that the HDMI OUTPUT was blocked. The jugheads they hire to handle customer service calls are just reading from a "script" and really know nothing about how things work. Now I am going to attept a home theater hook-up. Wish me luck!