I do know since I graduated high school last year whenever one would start to act weird or not work the teachers would always comment how they are glad its not the bulb. the bulbs if working will possibly sell for more than he $50. then again im no expert and you should do more research but I would start with the bulbs. I think one told me once a brand new replacement bulb costs about $500 whether he was right or not I have no Idea.