Question about Arris SURFboard SB5120 Modem

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MOTOROLA SB5120 I unplugged computer and modem to move furniture. When I plugged everything back in, the send light on the modem just blinks and can't get on line

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Turn off the modem for about a minute then turn it on while the computer is connected.
If failed, remove all connections and plug it same way. Check all cables if it is connected snugly.
Hope this helps.

Posted on Sep 12, 2008

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Sb5120 http broadband motorola com consumers support default asp supportsection cablemodems


Follow the steps in the quick start guide and it will install itself. If you don't have one. Plug everything in and let Windows see it. Likely will self install. If not you have to go to the Manufacturer's site and download the instructions.

Jan 23, 2014 | Arris SURFboard SB5120 Modem

1 Answer

Sb5120


1.screw the cable line into the (F-connector)port in the back of the modem just like a tv does.2.then use the RJ-45 lan cable supplied with the modem,plug it into the RJ-45 port in the back of the modem.3.then plug the other end of the cable into the computers RJ-45 port.4.then power on the modem by pluging it in,and letting it boot and detect the internet signal and all lights are on and in working order.then start surfing.The only time you will need the install cd is if you need to use the usb hook up on the modem.

Jan 31, 2012 | Arris SURFboard SB5120 Modem

1 Answer

My internet connection does not work. I can't connect to internet. My modem blinks but it seems it can not find anything to connect to it. It used to work for a few months but suddenly without any reason...


turn the computer off and unplug the modem for few seconds (15) then reconect the modem and let it start all the lights
about (20s) then turn the computer on.
if still cannot connect call your ISP

Aug 20, 2010 | Arris SURFboard SB5120 Modem

1 Answer

When i turnt on all lights stay on


You need to check with your internet provider, sometime they can reboot your modem from there office. Also try unplugging and re-plugging in the modem. Additionally try hitting the reset button on top of the modem. Hope the was helpful:)

Jul 22, 2010 | Arris SURFboard SB5120 Modem

1 Answer

I want to reset my modem but cant find the button


Hi, I'm assuming that this is an external modem, usually with todays modems just unplug the power source and cables, let it sit for 30 - 60 seconds, then plug everything back in. This usually works.


dont forget to vote

Oct 14, 2009 | Arris SURFboard SB5120 Modem

1 Answer

Motorola sb5120 trouble


the sb5120 does not have a reset button- you just unplug the power cord and plug it back in to reboot it, it is a modem not a router. click start-run- type: cmd and click ok then a black box will come up and type in: ipconfig and press enter and that should give you your ipaddress of your router if you are connected through a router

Jun 02, 2009 | Arris SURFboard SB5120 Modem

1 Answer

Cannot set up Motorola Surfboard SB5120 modem


This usually means something is not correct with your incoming signal. If your cable wire into the modem is being run off an amplifier in the wall this could be effecting your service. If the signal is too strong the modem won't be able to communicate for internet.

You could check the incoming wire to see if it is running off an amplifier. If it is you would need to run a new line that is not on the amplifier. I would recommend comcast coming out to check the signal frequency and make the necessary adjustments.

May 04, 2009 | Arris SURFboard SB5120 Modem

1 Answer

The power light and PC activity light are the only lights that come on. Send/Receive lights don't blink.


the most easy way to connect to the internet is get a bluetooth connetion (zippys) press the tools find device on the bluetooth on ur phone press pair device and press dial up inthe username put ur mobile number and password mobile number dial up number *99# dial

Apr 28, 2009 | Arris SURFboard SB5120 Modem

1 Answer

Wireless router stops internet connection to modem during install


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

Feb 08, 2009 | Arris SURFboard SB5120 Modem

1 Answer

Im having problems getting my modem to get online. The light wont come on. All but the online light come on. The online light blinks then all the lights go off except the power light, and the receive...


Your modem is not synching. It could be a number of possibilities, and you're going to have to do some troubleshooting to narrow it down.
  • Verify that your AC, Cat 5, & ethernet cables are connected securly
  • Verify that your modem is not in "standby" mode
  • Power cycle your modem
  • Try a different cable outlet
  • Call your ISP to make sure your modem is provisioned and your service is set up for cable internet.

Nov 06, 2007 | Arris SURFboard SB5120 Modem

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