Question about LG 42LC2D 42 in. LCD HDTV

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LG 720p 50" Plasma NO SIGNAL when components hooked up correctly

I have an LG 720p 50" TV I bought a year and a half ago. I get home from work the screen comes on, I can hear the sound from the speakers (its hooked up thru HDMI, so the cable is good) but the screen says NO SIGNAL. All the other inputs have the same result. What going on?

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