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Have you tried to unplug all the cables and plug them back again ?
Have you tried to use a DVD player or another input in order to see if it works ?
If you have already tried above two things then lets see if we are able to reset it:
Press and hold the MENU and VOL Down (-) button on the TV.
While holding these two buttons, press the power button on the TV.
Now after 10 seconds, let go these two buttons.
Wait for a minute or two to see if any picture comes on.
If that won't help then unplug it again for around 5 minutes.
Now press and hold the POWER button on TV and simultaneously plug it back.
If the above steps won't solve the problem, please post back.
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