http://www.youtube.com/watch?v=PNzqOGBSDpI
This is a problem I am having with my TV, if anyone has seen this problem before and knows what's wrong, please tell me. Smacking the TV on the back seems to fix it sometimes, and other times smacking it just changes the position of the problem on the screen. When I move my cursor over the problem area, it seems to lag in place than move to where it's supposed to be. I followed these steps, short of contacting service, and nothing worked. The reason I didn't contact support is because I got this TV on Craigs List.
http://support-us.samsung.com/cyber/popup/iframe/pop_troubleshooting_fr.jsp?idx=410590&modelname=LN40A500T1F&modelcode=LN40A500T1FXZA&session_id=QtnntfDCMJ3P2WqD3kqvNHtS3hTSFKRrNXBhPd4jGVLblvRCnbhV%21-1629814220%216502746%211357752110589&from_osc=

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