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What is the full model number off of the sticker on the back of the TV?
Also, who is your cable provider (Comcast, TW, ATT, etc.) and do you use a "Box" for your programming?
This info is needed to help you.
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Please follow the steps below:
1) Shut the TV off, and then disconnect the cable/SAT box AND the TV from power (unplug their power cords).
2) If using an HDMI cable, disconnect and reconnect the HDMI cable on both ends when the cable box is unplugged from power (make sure it's secure on both ends).
3) Press and hold the power button on the TV itself (not the remote) for 10 full seconds while the set is unplugged, then release the power button.
4) Plug the cable box AND the TV back into power, then turn the TV on and attempt to watch a program.