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Hi@Geoffeather,
Please try a power down (count to 5 ) and then power up the NBN NTD. If you have battery backup may need to remove the power cord on the RHS of the NBN NTD.
If this is unsuccessful try a reset via the rest hole on LHS of NBN NTD (need a pinclip or similar) press down count to 20 then release.
Your Modem should be connected to the UNI-D1 port (LHS yellow port)
Regards
Bryan