My dlp # HLN507 50" purchased in august of 03. When running for an extended period of time, usually on the weekend, the picture has "white flashes" that come and go, sort of like on x-ray, and gets worse as the set stays on. Is this the digital board, dmd, or something else? Also, periodically, the picture goes out completely. I can regain a picture by switching all my cables from component 1 to component 2 or 3. Can anyone help?