The owner will rarely try a new bulb so it's usually the end. They often want the shop to try a bulb and the shop won't unless the owner pays for the tech time and buy the bulb if it fixes it. You can see why there is a standoff there.
Given the age I suggest you dump it and move on. There are plenty of DLP repair videos and more on the web so I wanted to share this repair shop story and suggest the next move.
I have purchase this TV in May 2005. Blub has never been replace. Since last few week TV keep shuting down after in use for half an hours or so. When it shut down I do not see any of light blink on remote. Note that TV HDMI connection are going through Samsung sound systems. Any help appreciate very much.