Double line when watching dvd's-please help


Hi I have been getting a double black line (which is only visible against a light background)when watching dvd's. I have adjusted the round focus dial on the front of my projector, the sharpness control on both my projector and dvd player, but it doesn't make any difference. What could be causing this? Is there anything else I can adjust or do to correct this? Thanks!!
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Hi I posted this thread and think I was misunderstood. It is not a line from the top of the screen to the bottom. I see a thin black shadow line around any and all objects (people, trees, anything in the movie) I notice it with dark objects against a lighter background. I am using a Richard Gray power conditioner. Thanks.