■Macintosh OS 9.x:
On the Apple menu, choose Control Panels, then click
Monitors or Monitors and Sound. Select a different resolution.
If this option isn’t available, select one of the other compatible video formats listed on page 96.
■You may also need to modify existing presentation files if you created them for a different resolution. See your software documentation for specific information.
■If you’ve set up your projector and computer to display the same image simultaneously, the projector may only project half the image. Turn off the dual display settings.
The image isn’t rectangular, but trapezoid-shaped.
■Make sure the projector isn’t placed off to one side of the screen, at an angle, or the image won’t be rectangular. Place it directly in front of the center of the screen, facing the screen squarely.
■If you’ve tilted the projector upward, the image will be broader at
the top. Turn on Auto Keystone correction as described on
page 57 or hold down the 
or 
buttons on top of the projector until the image is rectangular.
The image contains static or noise.
■If you’re using a computer cable longer than 6 feet, or an extension cable, the image quality may be reduced.
■Keep your computer and video cables separated from the power cord as much as possible to prevent interference.
■The video signal may be split between the computer and the projector. If you notice a decline in the projected image quality when the image is displayed simultaneously on your notebook computer and the projector, turn off the notebook’s LCD display.
Solving Problems 85