I have a Hisense LCD TV 50" Model # 50K360G and everytime a VGA or HDMI wire gets touched the screen goes black with red or green or blue horizontal lines on the bottom of the screen with a very VERY loud high pitched static noise. The noise also resembles that of a jet plane engine and it gets louder and louder progressively The screen would also go full red or full green after. I do not know what happens after that becuase the noise is unbearable and it freaks out our animals so there is no point to see what happens further. SO...is my TV screwed? or is this fixable.