If only a partial computer image appears, try the
following solutions: 
- 
Press the
Aspect button on the remote control
to select a different image aspect ratio.
 
- 
Check your
computer display settings to disable dual display and set the
resolution within the projector's limits. (See your computer manual
for details.)
 
- 
Check the
resolution assigned to your presentation files to see if they are
created for a different resolution than you are projecting in. (See
your software help for details.)