When I turn on my Vizio P50 plasma set there is now a pink line from top to botton on the far left side of the pic. And now when I use the volume control the graphic box that shows the volume level in gone and there is a gray box there with nothing in it. The volume does go up and down but you can't see the graphic box. The set is 6 years old. No problems until now. Any ideas on what is wrong? The set still works fine other than the pink line at left and volume graphic problem.