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Check that all cables are intact and plugged in correctly.
Turn of the TV completely. There might be a manual button on the tv for this. As the last thing, remove the power cord from the power outlet in the wall or where it is placed. Wait 1 min. Then put it back in, swith it on and turn on the TV again.
If this doesn't help and you have tried replacing the cable that you get the picture from (VGA, DVI, Antenna etc.) then it is most likely broken.