I have a 46" Samsung DLP, 2 yrs. old. I am trying to diagnose exactly what needs to be replaced. There is absolutely no picture, audio though, and when I plug it in it flashes LAMP. It then will turn on and off a couple times by itself until it finally shuts off for good and all 3 lights begin blinking. Now, I have replaced the lamp and this has had no effect on it. Is the ballast possibly the culprit? If not, what could be causing this?