i have a 60" Mitsubishi dlp. it got really dim, I changed the lamp and it worked great. Turned it off and when I turned it back on, I got sound, but just a black screen. after a minute, the red lamp light came on. I took the lamp out and checked everything, put it back in and turned it on. It worked great all day. Turned it off and now just sound for a minute til the red lamp light comes on. Took it out a few different times and checked the connections, but still just sound. Any ideas?