InFocus IN3902LB User Manual page 21

Problem
No computer image, just the words "Signal out of
range"
Only my laptop's background appears, not the
Desktop icons
Solution
Press the Auto Image Button on keypad. 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"
DisplayLink - Use DisplayLink software to change the display
mode from Extended Desktop to Duplicated Desktop.
Windows - Disable "Extend my Windows Desktop" in Control
Panel > Display > Settings > Display 2 (location varies by
operating system)
Uncheck this
option, then
click Apply
20
Result
Computer image projected
Background and Desktop projected