Just purchased my first HDTV (Samsung UN46D6500) - a LCD/LED display. At the moment I do not subscribe to any HD content so all my cable channels are SD or 4:3 format. I really hated the stretched out look and changed the display from 16:9 to 4:3 so at least the picture looked somewhat normal. However, upon reading the user's guide - it states "not to set your TV to 4:3 for a long time." It goes on to say the borders surrounding the video may cause image retention (screen burn). Has anyone had problems in this regard? Am I stuck watching the stretched picture in 16:9? Any thoughts or opinions?