I have lines and black spots all over display

Most likely you have a failing DLP chip. The DLP chip is the one that forms the image that is projected onto the screen. Search for "Mitsubishi Black Dot" in your search engine and you will see you are not alone. Apparently, a lot of DLP chips in Mitsubishi products are failing. With the low price of projectors these days, your best bet is replacing it. If you want to repair it yourself, the chip will run you about $200 to replace and may require soldering.

Hope that helps,
Bax