Ask Proxima A3100 Manual page 17

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"
If your computer is using the DisplayLink connector,
use DisplayLink Manager software to change the display
mode from Extended Desktop to Duplicated Desktop.
See the DisplayLink Manager User's Guide for more
information.
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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http://www.pureglare.com.au
Result
Computer image projected
Background and Desktop projected