WHY WONT IT COME ON?!?!?!?. I GO TO TURN MY TV ON AND WHEN I DO, THE GREEN POWER BUTTON LIGHTS UP

Question

I GO TO TURN MY TV ON AND WHEN I DO, THE GREEN POWER BUTTON LIGHTS UP MAKES A SOUND LIKE THE TV IS GONNA COME ON, AND THEN NOTHIN.. NO PICTURE SOUND NOTHIN.. IT JUST PRETTY MUCH SHUTS ITSELF OFF..AND THE GREEN LIGHT BLINKS 3 MORE TIMES AND MAKES THAT SOUND ALL ON ITS OWN.. BUT THE TV WHATSOEVER WILL NOT TURN ON! IM SO UPSET! BIG BROTHER IS ON TONIGHT!