Blue Line on Sony 55inch HDTV

Hi I got a sony 55 inch tv and I had a dvd plugged in, the disc was skipping in the dvd so i took it out and now there is a blue line at the bottom left hand corner its always there only when you turn off the tv is it not there. I got some of it to go away by just unplugging the tv but not much. Any clue whats wrong with it and if I can fix it without calling the warranty people?
Thanks