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What type of input device are you using with the projector?
What type of input cable are you using?
Try using a different cable or different input device, and let me know if the same problem affects all input types.
Try adjusting the focus ring on the projector. Adjust the Brightness and Contrast settings on the Video main menu. If you are viewing a computer image, also try adjusting the Comp Tracking and Comp Sync buttons on the projector's control panel.
Let me know the results...
Ok, then it is an internal problem if all inputs are affected in the same way - did it get a knock or anything?
Have you removed it from the ceiling yet?
You will have to look inside it to check if anything has shifted, e.g. the optics or the lens.