This is driving me nuts but somehow I managed to get into a special menu that had lot's system info displayed. It is not a normal system menu selection but some keypress when in the settings menu to access it. The time I happened to discover it there was some good diagnostic stuff to look at. This was on a 830 box but I would think it's available on other 600 / 800 series receivers. Anyone know of this feature?. Maybe I was seeing things or who knows what.