As bizarre as it may seem, especially in this day of interactive and sophisticated A/V systems, I have found when dealing with technicians their knowledge is generally restricted to their own product and little or nothing is known about the interaction of peripheral equipment that is hooked together with it. Unless there is a problem with the signal on the screen, cable and satellite people basically no nothing about televisions and generally speaking unless they are an enthusiast, none of them knows anything about Audio/Video systems and Home Theater and how it all ties together.
In the end, you have to do your own trouble shooting and by trial and error try to pinpoint where the problem may originate. Frustrating, but a reality that never seems to change.
