My screen was black but I could hear the sound. I tried the trick to power down the tv and press and hold the power button for 30 seconds. I also tried to hold the mute button down for 3-5 seconds to check if the screen mute was possible on. Neither of those worked. Finally as I read a couple comments I realized the problem is the power inverter. So I again jiggled my power cord to make sure everything was correct. Nothing happened. But a couple taps to the box area of the power cord worked!! Tv screen looks norm again. May only be a quick fix, I'm not sure.