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Have you tried switching inputs? On some sets if it is set to s video all you get is a dark screen. Check your connections if you have other inputs. If you can't switch you should at least get the menu on the screen proving the tv is working and it is a setting.
If you get channels 2 to 13 nice and clear but the rest are snowy, it means that the TV is set to the broadcast channels, which means that for the channels above 13 it is tuning in the old-fashioned UHF channels. If the TV is set to the cable mode then it tunes in cable channels above 13. To do this, enter the menu and navigate to the tuner settings, set the tuner to standard cable and then do the autoprogram, and the tuner's memory will be set for your cable system.