Zoomax Mars HD-Portable Video Magnifier User's Guide
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5.3 Powering on the Mars HD While Connected to a PC
Start up your PC as normal. Plug one end of the USB cable into your
PC and the opposite end into your Mars HD. Power on the unit and
then open the ZoomaxViewer software.
NOTE: Be sure to open the ZoomaxViewer software after you
have powered on your Mars HD. Performing these steps in the
wrong order may result in connection failure.