If the projected image is not evenly rectangular,
try the following solutions: 
- Press the  Auto Keystone button on the
remote control to automatically adjust the image shape. Auto Keystone button on the
remote control to automatically adjust the image shape.
- Place the
projector directly in front of the center of the screen, facing it
squarely, if possible.
- Adjust the image shape using the keystone settings
in the projector's menu.
- The projector may show a gray shadow around the
image. This is normal.