Question about Arris SURFboard SB5101 Cable Modem

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My motorola SURFboard SB5101 has a on power light, a blinking recieve light, and an on PC/Activity light, with the other lights off. what is wrong with it?

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  • 142 Answers

The light pattern you have described indicates that the modem can not establish a connection to your internet service provider (ISP). This is typically do to a signal related issue. To trouble shoot the problem you will need to connect the modem directly to the main cable line where it first enters into the home. You will know when the modem establishes a connection by the top 4 lights becoming green. If at any point all 4 top green lights start to blink in sequence than you will need to contact your internet service provider to "unwall the modem". Remember most internet service providers require you to register your modem on there network. So if you have not all ready completed that process you will most likely not have access.

I hope that information above has helped is some way.
If possible please rate this solution.

Posted on Sep 01, 2010

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Related Questions:

1 Answer

I have a SB5101 modem, I rebot the modem and now it doesn't work , just the power light and the pc/activity(ambar) are working what i should do?


Try this unscrew the cable from the back rub your finger over the center and the side of the cable.Unplug the modem for 20 seconds plug the modem back in and immediately put the cable back in.
I can explain how this works but would take to long.

May 04, 2012 | Arris SURFboard® SB5101 Cable Modem

1 Answer

The PC/ACTIVITY my Motorola modem isn't on... i don't know what to do.


if all of the other lights on the modem are lit, except pc activity, that means the modem isnt communicating with the computer. 3 things can cause this - modem could be bad, ethernet cord could be bad, or the NIC card(the card in the cpu that houses the ethernet port) is bad. Most of the time its the ethernet cord or the NIC card in my experience. Dont fret, both of those are relatively cheap fixes.

Apr 04, 2010 | Arris SURFboard® SB5101 Cable Modem

1 Answer

Flashing PC/Activity light


Yes. I've put a piece of tape over it, so that the blinking is less annoying.

Nov 17, 2009 | Arris SURFboard® SB5101 Cable Modem

1 Answer

Motorola cable modem sb5101 the receive light blink an the same as the send light


If you are able to access the internet this is a normal operating status. These lights are just letting you know there is activity present with the modem and the modem is sending and receiving information with your provider.

Nov 08, 2009 | Arris SURFboard® SB5101 Cable Modem

2 Answers

My Motorola Sb5101 modem will not let me access the internet, the send light constantly flashes and i can't attain any internet connection.


If you have the following lights :
Power light - on
Receive light - flashing
Send light - flashing
Online light - off
PC/Activity - on
Standby - off
Then your Network Access is OFF - modem is successfuly registered but Network Access Control is disabled via DOCSIS configuration file.

Call your internet service provider....

Nov 06, 2009 | Arris SURFboard SB5101 Cable Modem

3 Answers

No connectivity; constant blinking LED lights "Receive" and "Send"


Or you didn't pay your subscription on time and the ISP disabled your cable modem to send user traffic over the cable network. When both Send and Receive lights are blinking that is a visual aid that the modem is working fine, but the ISP disabled its access to the network (unpaid bill, legal issues, etc.)

May 17, 2009 | Arris SURFboard SB5101 Cable Modem

1 Answer

Recieve and Send lights blinking


Are you unable to connect? The send and rcv lights should be blinking. Make sure that your link light is on and not blinking. Your link light is your connection to your ISP

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