I have a 27" Flat Analog Direct View TV, model # AV-27CF36. I lost the picture a couple of nights ago. All I get is a solid blue screen with the channel # 3 in the upper left corner inside a black box. The tv no longer responds to the cable box or to a direct cable link. I can get other on screen displays, but absolutely no picture or sound. I changed the cable box and there is no change. Can you help?

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