Trying to help a neighbor. His projector was flickering, so I told him to test the cables. Upon doing so, it worked for about 4 hours before the screen went dark grey. He mentioned that he looked straight at the bulb and there was a pinprick of light, but nothing that would project. I had previously suggested that he check the bulb hours, but he didn't do so. Now I don't think he can. My best guess is the bulb. Any other possible ideas?