Question about Arris SURFboard SB5120 Modem

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Ethernet Port seems to be a failure, but the USB works fine

Initially I hooked up my modem through the USB port on the back. Now that I want to set up a network, I need to use the ehternet port, and when i tried to do so, it could not detect any PC activity at all. The LED lights still read Power, Recieve, Send, and Online, but no PC?ACTIVITY.

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  • Michael Serrano Jan 22, 2008

    Oh man, I am having the same exact problem can anyone plz help?

  • Michael Serrano Jan 22, 2008

    I am having the same problem when I switch from USB to Ethernet

    All lights are on except Pc/Activity. Can anyone help?

  • Michael Serrano May 11, 2010

    I am running on Vista Home Premium, and also when i connect the router (Linksys WRT54G) to my PC it does pick up the router but when i connect the modem to my PC via ethernet their is no activity

  • paul shaw May 11, 2010

    Is your ethernet card turned on ? check in device manager. Which windows r u using?

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I managed to fix the problem manually using a computer kit I had.
The problem was the Ethernet port on the modem was messed up
you should check if the small wires are on the back are all facing towards the top if not you should try to fix its actually pretty easy
no need to pay for a repair :D

Posted on Jan 31, 2008

  • Michael Serrano Jan 31, 2008

    Ok I managed to fixed the modem manually. The problem wasn't the computer or the router it was the Ethernet port on modem. Check if the small wires on the Ethernet port are all facing up if not try making them face up it with a computer kit or something that could fit inside the port. I managed to fix it with a kit I had. Hope this helps.

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Doing the same thing to me Im going crazy. The ethernet port works for my xbox 360 but when I put the thernet into my computer it dont work.. just the usb gives me internet activity HELP!

Posted on Feb 14, 2008

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I am having the same problem! ... I called Motorola today and explained my problem and told him everything I had checked through troubleshooting. The fact that I could get reception through the USB cable port but not the Ethernet port, told them that I may have a bad Ethernet port on my modem. They have a two year waranty that will cover replacing the modem. They just need the serial number listed on the bottom. Mine is older so I will be looking into repairing the port or replacing the modem myself. If that doesn't fix it, it will be back to the ole' drawing board. Any suggestions would be great!
I am also using a Belkin router and all of my drivers are up to date.

Posted on Jan 29, 2008

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