Maybe you could "borrow" a dvd from a friend and see what this different dvd does. I would be sure that the "test" dvd had the 3 prong connector.

Ground loop problems can be EXTREMELY difficult to solve. I wish you luck!!!!

The Rat. M80s, VP-150, QS8s, SVS PC 20-39+, OPPO, Onkyo 703s, Harmony 880 Sony 60" SXRD HDTV