I'm very sorry for any inconvenience this may have caused you. Unfortunately, this sounds like it may need servicing. Here's the thread where you can get details on setting that up: http://forums.cnet.com/7723-13973_102-542437/service-issues-click-here-for-help/
I have a 50" inch Samsung plasma tv, model PN50C490B3D, that has started to develop thin vertical colored lines on the screen over the last few months. It wasn't bad when it was just one but now there are several over then entire screen. Does anyone know what the problem could be and how I can fix it?