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Thin white line has appeared on my Samsung Samsung LE40R74BDX?

I have a Samsung LE40R74BDX. A thin white line has appeared on my television across the middle of the screen. It only appears when I am watching anything in HD, such as when I'm using my Xbox. When I watch anything in SD the line disappears. Can anyone help?
James, July 2010
link Click here to see other fixes for Samsung.