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try resetting the settings to factory default through the menu. if there's still a problem, take the cover off. if you look from the back of the machine, inside on the bottom left, you'll see the main board attached by a large white plug. use something thin and non-metalic to push the bottom of the board towards the plug to tighten it. now do the same to the other side of the plug. this should solve it. if it doesn't, you need to replace the main board.
Sounds like focus is out. These projectors are like cameras; they have an optic with a focus ring. Try rotating the focus. Some have electronic focus as well. If the manual focus does solve the problem, look through the menu for a focus setting adjustment.