I originally posted this in one of the projector forums, but it was suggested that I check here for help.
Trust me, I have searched a bunch on the forum, but can't find my answer.
All of my components (two Tivo's, DVD player, Yamaha receivers) are at the front of my room, and the projector (IN76) is at the back of my room. The outlets they are plugged into are on seperate circuit breakers.
The best I can tell, all equipment is properly grounded, including the Sattelite multiswitch outside and the sattelite dish on the roof.
I have a couple rolling bars slowly moving from the bottom of the screen to the top. If I put one of the 3 prong to 2 prong adapters on the IN76 power cord (eliminating the ground) the ground loop bars go away. So, it appears clear it is a ground loop.
The IN76 is plugged into a CyberPower UPS (550va), which I originally bought because we have frequent 1-3 second power outages during thunderstorms and I was trying to protect the projector/bulb. Obviously, this UPS is doing no line conditioning. I think this is the model (I bought it at Best BuY), but can't get to it easily right now to to confirm the model number. http://www.cyberpowersystems.com/CP550SL.asp
So, it appears that I need a line conditioner, or a UPS/Line Conditioner combo. I read in one thread that plugging a line conditioner into a UPS can be a fire hazard and void home owners insurance, but I don't know if that is true.
So, what is my best bet? It appears I need something with a floating ground setup (not even 100% sure what that means ), but I also need to keep my projector on a UPS because of the power outages.
I would rather not spend several hudred dollars if I can help it, so I would like the cheapest possible solution that will cover my ground loop issue and protect me from the thunderstorm power outages.