I had that happen on a 2006 vintage C120. To, troubleshoot, we disconnected all the cables, turned on the mfd and it stayed on. Turn off and connect one cable at a time, boot the mfd. On ours it turned out to be the gps antenna. When that cable was attached, the mfd would start then reboot itself. Replaced gps antenna and all was well. May work for your mfd.
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Cheers, Kevin
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