I am getting confused between Directv and Sony. The problem is that my HR20 DVR player and my Sony Bravia flat screen keeps losing audio and sometime a purple screen. Both companies are pointing to each other and I just cannot get a positive lead on what maybe causing the problem. Are these problems being caused by the vendors themselves or is it the cable? If it is the cable what should I look for on buying a new cable? I have heard there are specs like 1c and others, but which one would be the correct one? Thank you for reading this.