Check that there is power available at the DSM. Then verify that the DSM connector cable is correctly connected between the DSM and the C120. Finally, be sure that you have the most recent software version installed ( V 4.29). If all of that fails to bring back the DSM, try a factory reset. You accomplish this by holding down the first softkey while powering up the display. Hold the softkey until the reset countdown ends and the display begins to reboot. Be aware that a factory reset will delete any waypoints, routes, etc. so be sure to back upp anything important.
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