Hoping someone can help. My Sharp projector has developed a 'judder on the image. It's almost as if the refresh rate has dropped so that people moving across the screen judder rather than move smoothly. I've got it hooked up to a Pioneer 757 DVD using component out to 15 pin Dsub in. The projector is mounted upside down on my ceiling and has less than 200 hours on it. I've tried a different source (Sky digibox-not the best source but good enough for comparison) and have the same problem. DVD on TV no problems either. Any suggestions?