Connection

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Level 1a
Greetings,
I’m trying to first time connect using my recently received modem.
Unplugged my Foxtel modem which was working till that point .
New Tpg modem internet orange light will not turn green.
Uni d light also remains orange .
If I plug Foxtel router back in I get wi fi back again.
Plug Tpg in ... no success
Please assist