Question about LG 42LC2D 42 in. LCD HDTV

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Screen and sound cut out while watching TV

We have an LG LCD TV and last night in the middle of a program our screen when black but there was still sound. We pressed the input button to see if we could select HDMI again as that was the connection from our BT Vision box but the screen remained black and the sound disappeard. We've been unable to get a picture or sound since. Help!

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