Last night I came home and when I turned the screen on it was blank. When I turn the power on I get a quick RGB squiggle in the middle of the screen. After a lot playing around (turning it on and off, moving the case around, etc.) the picture came back. This morning the same thing happened. I managed to get the screen to come back, but it only lasted a few minutes. Any suggestions on what might be wrong? A rear projection tv troubleshooting guide would be great if anyone can suggest one as it might save me paying for a service. I have heard projection TVs have to have to be serviced every few years or so many hours, is this true?