I've got my projector going OK for the most part, but I have a problem with uneven brightness. The right half of the screen is brighter than the left half, and there are a couple of lines running through the left half. I don't even know where to begin searching forum archives, so I've attached a picture. The problem is most noticeable with dark scenes, making it really hard to get a picture of it, so I took a picture of the green raster. It may take a minute to make sense of it, because I couldn't get the whole thing in the picture. Just imagine that the green area is a rectangle, and you'll easily see the brightness differences I'm talking about. I really appreciate any help I can get, as it's been this way for a few months and I'm totally lost.