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I show a dark spot when I have a blue screen?

In the same location, when projecting a picture, the spot has a yellowish tint. What is wrong with the projector and what is the fix?
george peltz, May 2011
I got the same probs with my infocus when connected to laptop but its perfect pict if i used av cables so i dont think its the bulb maybe something more.... Still digging for a solutions up to now.

arnesalex, July 2012
Is it in the top corner? Ive got a blue line and a yellow smudge on mine, I think it could be the mirror.

Sonya, September 2011