Epson 450Wi Only part of the computer image is displayed., The image isnt square, but keystone-shaped.

130 Solving Problems
4. Do one of the following:
Mac OS X 10.6.x: Click Show displays in menu bar.
Other versions of Mac OS X: Make sure the VGA Display or
Color LCD dialog box is selected, click the Arrangement or
Arrange tab, then make sure the Mirror Displays checkbox is
selected.
Only part of the computer image is displayed.
■Press the Auto button on the remote control or the Enter button
on the projector.
■Make sure the image Position setting is correct in the Signal
menu. See page 74 for more information.
■Press the Aspect button on the remote control or select the
correct Aspect setting from the Signal menu. See page46 for
details on the available options.
■Press the Esc button on the remote control to cancel the E-Zoom
function.
■Make sure your computer’s resolution setting is correct. See the
compatible video formats listed on page 145.
■You also may need to modify existing presentation files if you
created them for a different resolution. See your software
documentation for specific information.
■If you’re projecting a widescreen computer image, adjust the
Resolution setting (see page 73), if necessary.
■If you’re projecting an image from a computer with dual display
activated, turn dual display off.
The image isn’t square, but keystone-shaped.
If the image isn’t evenly rectangular, adjust its shape using the
Keystone setting on the Settings menu (see page 75).