I have a pineer projection monitor that was manufacter in August of 1996. When i turn it on it'll stay on for while an then shut it self off this happen when i'm watching the TV or DVD sepeclly when i turn on the DVD. I let it cool down for a while turn it back on an turn the DVD player back on an will shut it self off, i really don't know whats going with it please can you help me. The numbers on it are as follows SD-P5191-k and SN-QH604190 L