This problem just appeared out of nowhere one day, with 3 horizontal lines of stuck pixels, approx 5 pixels long each. The next day, the lines were much shorter, about 2 pixels each, so I thought it would go away. Well now they are over 10 pixels long each, but they seem to grow or shrink a few pixels each day. I'm not sure if they are stuck pixels, because on a white background they are black. On a black background they are gray. Any ideas what this might be? I ran the pixel strobe repair thing for 30 minutes and it didn't help. Thanks for any ideas.