4kw Open Array not connecting

[JVM225]

The boat is new to me. Radar worked well on sea trials and subsequent runs. Finally brought it home Sunday and it worked perfectly for the 6 1/2 hr cruise home.
I shut it down by depressing the standby button on the MFD once I got home.
But was unable to get it going again later that day when I was sitting at the dock and wanted to spend some time familiarizing myself with it.
It is networked to 2 C125 MFD's updated to Lighthouse version 17 several months ago. There is also a Ray 240 on the network.
Boat batteries test good, are fully charged, and charger/convertor is on.
Message: "Radar 4kW HD Color Array (-30023) Off/not connected".
I select on then after a brief waiting period while it is trying to connect I get message:
"No Radar source found"
I've already tried to correct it by doing a "System settings & Data Reset" but it didn't help.
Is there anything else I can try?