Mercedes E320 install issue

Yesterday I installed a grom mst4 in my 2005 E320. I used the fiber connection at the cd changer to plug into the grom. checked for power at the grom and had it. My command center will not boot up now. Any ideas.
  • Please make sure you have fiber optic lighting facing the correct direction. If light is not traveling the correct direction then it will not allow other items on the MOST bus to work properly.

    Make sure also you have GROM powered correctly to 12volt Constant power and Ground.  A switched 12v power source is not the proper wire connection for the GROM.

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