InFocus LP 640 User Manual page 18

No computer image, just the words "Signal out of
range"
The video embedded in my PowerPoint
presentation does not play on the screen
Adjust computer refresh rate in Control
Panel>Display>Settings>Advanced>
Adapter (location varies by operating
system)
You may also need to set a different
resolution on your computer, as shown
in the following problem, "Image fuzzy
or cropped"
Turn off the internal LCD display on your
laptop
18
Computer image projected
Embedded video plays correctly