If the projector is not aligned correctly the image can be skewed and can cause key stoning. Key stoning refers to distortion of a projected image in which the top of the image looks broader than the bottom.

  1. Make sure the projector is flat on the desk or aligned perpendicular to the screen. If wall or ceiling mounted, make sure that the projector lies flat.
  2. Most ViewSonic projectors have a Keystone button on the Remote Control or on the Projector itself.