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When connecting the device the blue and green lights both blink slowly and they never turn solid green

In this case you can try restarting or power cycling modem for a minute then check the light status on the modem. If still same we need to check the cable signal level coming from the service provider to the modem to isolate the issue.

http://arris.force.com/consumers/articles/General_FAQs/SBG8300-Cable-Signal-Levels