I recently bought an Epson PowerLite 5550C off of eBay. It was working fine, except for a yellow line across the top of the image whenever it was upside-down. I could hear something fall a bit whenever I turned it upside-down, so I tried to open it up to find the moving piece. I unscrewed the screws from the bottom, back, and sides to try to open it. It still didn't open, so I put all the screws back in and figured that I'd ignore the yellow line. However, afterward, there was also a red line, and it became much more difficult to focus, especially when upside-down. Is there any way to fix this? If there's any more information that I can give, just ask.