Question about Arris SURFboard SB5120 Modem

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Wireless router stops internet connection to modem during install

I have a Motorola SB5120 Surfboard modem that I got from Comcast. I just bought a Netgear Wireless-G Router WGR614v9 to connect my laptop wirelessly so I don't have to use the Ethernet cable anymore. I have internet when I begin installing the router and my modem works great. Then the instructions tell me to unplug the power source of the modem and hook up the modem to the router with the Ethernet cord. When I re-plug the powersource into the modem, only the Power light and the PC/Activity light comes on. I have no internet connection what so ever. In order for me just to get internet straight from my modem without the router, I have to unplug the power cord again from my modem and use the Comcast CD to reset all of my settings to the default settings. There's no powercycle or reset button on my modem and I wait at least 2 min before plugging in. I don't know what's wrong!

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  • babyrhayne Feb 08, 2009

    Yes, everything comes with a little picture to go along with the installation instructions. I follow the picture to a T. I'm by no means a hi-tech person and I can't configure my own settings or anything like that but I do know the basics and have hooked up wireless routers on my own laptop and others before. This has never happened.

  • Anonymous Mar 31, 2014

    Will my Motorola modem/router SBG6580 work with Century link highspeed internet?

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  • 102 Answers

Are you sure your hooking the comcast modem in the right place?

Posted on Feb 08, 2009

  • bassass Feb 08, 2009

    XP Or vista?

  • bassass Feb 08, 2009


    Do a reset on the router, make sure you are on the latest firmware, and test without wireless security.



    If none of that helps, then you may have a bad wireless radio in the router.


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