Hello racerdreams.
My first question is, have you reset the lamp timer? The lamp timer is a small program on your TV that keeps track of the amount of hours the lamp is in usage, so when it reaches a certain limit, it will send a signal to the DMD that starts to shut the TV after a short while, thus preventing the TV to turn on most of the time. Here are the instructions:
http://www.fixyourdlp.com/forum/viewtop ... =10&t=1050
Another chance is one or more fans might not be working properly, if so then the DMD is also picking up this abnormality, one last thing, did you close the lamp door before trying to turn on the TV, because there is a switch that if not pressed sends another signal of an abnormality to (you guess it) the DMD.
Hope this helps you out.