I cant figure this out...i have a 55 inch tv and a 32 inch. when I plug my laptop to my 32 inch, i get both sound and picture on TV but on my 55 inch it wont allow the laptop sound to go onto there, picture only? when i go to sound settings with my 55 inch tv hooked up, it says HDMI is not hooked up. I have tried all different ports and cables as well. any experts help?