Why is my tv shutting off and then sitting there with red light blinki

he 12 blinks is a code on this set, and points to a communication failure/error between two of the circuit boards in the set. In most cases this requires replacement of a component in the TV.

However it's worth it to try a hard reset, as sometimes the processor in the TV can simply have locked up.

The first thing you would try, is disconnect the set from power, then press and hold the power button on the TV itself (not the remote), for 10 seconds and release. Then plug the set back in, and also check that the power cord is connected tight at the TV as well. Press power once, and see if the set powers up normally. Try this procedure up to 2 times, and please let me know what happens.