My Samsung HL-S5687W was perfect for the first few weeks. Now, I have intermittent horizontal dashed lines, white and blue, that appear on the screen in clusters. They occur mostly on HD channels, but also when a DVD is played. I just bought a Panamax Line Conditioner with no improvement whatsoever. I have two other HD TV's and they are not affected by whatever this is. Can anyone give me any ideas of where to look or what to try?

Setup:

Samsung HL-S6587W
SA8000HD connected via HDMI (Also tried Component)
Onkyo DV-SP404 Upconverting DVD Player connected via HDMI (Also tried Component)
Onkyo HT-790 Home Theater Audio System
Panamax M8HC-Pro Line Conditioner
All Cables are Acoustic Research Pro
Have tried three different electrical circuits

Probably need to call Samsung.