AV-56P575 problem of a black rectangle block showing on all analog inputs. HDMI input works fine.

Hi, I have an AV-56P575 and using DirecTV. Recently I started to see a black rectagular box blocking out the about a quarter of the middle of the screen. It happens on all of the video inputs, but not on the HDMI-to-HDMI connection. Please help. Thanks.

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