Someone gave me an old LP290 projector and it runs but the screen image is really dark. I'm thinking that the bulb needs replacing but I would hate to cough up the $$$ for a replacement bulb only to find out that it isn't the bulb at all. Does anyone know of any way that I can check before I make such a costly (possibly) bad investment in something that is useless. Thanks for any advice. pcguru2000