InFocus IN5555L User Manual page 15

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 Sync button on the keypad or remote.
To adjust computer refresh rate, go to 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."
Windows - Disable "Extend my Windows Desktop" in
Control Panel > Display > Settings > Display 2 (location
varies by operating system).
Uncheck this
option, then
click Apply
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Result
Computer image projected.
Background and Desktop projected.