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 read a thread on this forum that Samsung fixed the white dot problem on their DLP HLT5076SX/XAA. Is this still the case?If so should I call Samsung directly?