I'm very sorry for any inconvenience this may have caused you. There's a simple test you can do to determine if it is indeed the TV itself or some input device: turn on a menu. If the menu is obscured, then it's something wrong with the TV.
Generally, you can try a reset, and if that doesn't work, then it'll most likely 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/
My Samsung Plasma Screen tv has been working perfectly fine now it has a clear strip in the center of the screen above and below the center the picture appears to be bleeding over or stretching any suggestions?