Well make sure it's on the right source, I have a 50 inch Samsung and when you're on the wrong channel it'll read no signal and you can't do anything. So make sure you have cable hooked up right and make sure it's on the right source or video channel first. I don't know but this might help.
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Panasonic TH-42PWD6UY 42 in. HDTV-Ready Plasma Television
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