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I have tried everything and can't figure out why my projector shuts off on me when I first turn it on? Does it have to be in a warm up mode for a certain amount of time before it will project? When it shuts off I get a "P F" (although the F is upside down) and then sometimes I get a 19 in the code display. The yellow led is blinking when I turn it on and the manual said something about improper connections. I have checked and rechecked all connections and everything is proper. It will start up and run the fan if I don't give it a signal and then about 5 seconds after I turn on a signal it shuts down. I have to remove the power and let it reset and then after a few times it will kick out a picture. Once running it will run just fine as long as I want it to. Please help ... anyone....