I'm trying to set up C420S4 system but can't get the hub to set up.  It doesn't show a solid amber light.  I have tried resetting numerous times but after the rapid blinking red light indicating a successful reset, the light reverts to flashing red and green. 

I am using the power cord and ethernet cable supplied with the system. I have tried leaving it on for a lengthy period (as per advice in another thread regarding no amber light).  Still no amber light. 

Modem is Telstra 5g second generation.