I am getting intermittent violet scan lines on certain HD channels. Most notably HBO-70 and Discovery HD-76(I think that number is right). Has anyone seen this from their HD Tivo and if so can you guide me to where to look for problems. I don't want to blindly call D* unless I have some idea of what the problem is. I'm kind of hoping it is the HR10 as it would be a great way to grab an HR20 with no committment. I can always pick up another HR10 off ebay. Thanks in advance for any advice. Oh--still have the old oval dish and two other SD DirecTivos hooked up.