A hint--if the green power light comes on for a few moments and goes off do the self check this set has.
On the front of the set press and hold BOTH THE MENU AND INPUT (OR DEVICE) BUTTONS BOTH FOR AT LEAST 5 SECONDS. Release both buttons and look at the power button.
this is the case the power light will blink a two digit error
code--most common in this case is 2 blinks, a pause and 2 blinks--it
will repeat the code up to ten times.
Let me know if you find an error code or the power light just blinks and never stops.
If this helped you rate this solution as I do this here for free.