Question about Arris SB5100 SURFboard DOCSIS 2.0 Cable Modem (50120900100)

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ONLINE light is off, power, receive and send are on.

My ONLINE light is off. Would the cable connector going into the modem be the problem?

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Online Flashing - Scanning for a network connection.
On - Startup process complete. Modem aqcuired.


No online means no connection to the cable company DHCP server

Posted on Aug 17, 2008

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1 Answer

Receive and send lights keep flashing and no connection can be obtained


Reset the modem by removing the power for at least 45 seconds,try to get online.
If you have a router, reset that also. Modem first, then router,in sequence.

Check the cable going to the modem for any cuts or connector is loose.

If it still won't work ,replace the cable.

Lastly, call your Internet provider.

Nov 27, 2010 | Arris SURFboard SB5101 Cable Modem

2 Answers

My cable modem wont connect to the internet anymore.. all lights are on except the online light wich just continously blinks.. then when i go to logs it sais something failed what do i do?


I have a similar modem, my online light ( orange) blinks all the time, it is supposed to when you are online.
Have you checked your cable input, is it screwed in tight, how about where it attaches to the wall connector.
Unplug your power lead to reboot the modem.
Check your internet settings.
Control panel / internet options / connections / lan settings.
Is automatically detect setting ticked, if not tick it.
Is use proxy ticked, it should not be usually.
Have you a spare ethernet cable to check if that is a problem.
Still having problems? write back.
BTW i am in UK so some of the advice may differ for you

Aug 20, 2010 | Arris SURFboard SB4100 Modem

1 Answer

I have a Linksys modem with a netgear wireless router. The other night my internet just stopped working and now it is though the modem is not transmitting a signal. I have connected 2 different computers...


the ds light is for downstream which is your digital signal simply put...... if the light is not going solid to denote being :"online" there maybe signal related issues. rain will mess up the cable signals as the service is exposed to elements etc.....here is a trick i do with a modem that doesnt want to lock on to good signal.....reboot the damn thing...........give it a minute or two.. if the online light doesnt sync up solid....unscrew the cable connector on the back of the modem while it is powered up and wait 15 seconds////then screw it back on (needs to be hand tight, its like a water hose, if its loose you get signal loss) and give it 10 minutes......if it still doesnt lock up and go solid indicating online then call your cable company, you should not get charged for their service not working correctly..........it then would be something only a tech could fix. but if it does lock up and go solid ....hook up your router , power it up and give it a minute to sense the modem, restart the computer and you should be good to go...

Jan 21, 2010 | Linksys WCG200 Wireless Cable Modem 54G...

1 Answer

I can get local access but not internet connection. I have cycled the power on both the cable modem & Belkin wireless router. I can get a lan cable connection from the modem directly to my laptop the...


if you connect the modem directly to your computer, Does it work ?
If you are not able to go online when connected directly to the modem then you will need to call ISP.
If you are able to go online when connected to the modem only then you will need to check the settings of the router.
Click Here for more info about routers

Oct 30, 2009 | Belkin Wireless G Plus MIMO (F5D9230-4)...

1 Answer

Cannot go to internet


As stated on your previous post asking this question:

"If the "Online" indicator is not on, then the modem does not have an internet connection. The only thing you can do is unplug the modem for 15 seconds and plug it back in. Wait 30 seconds for it to cycle and the lights should all come back...if the "Online" light still does not go on, then you need to contact your internet service provider."

There is really nothing else you can do!

May 05, 2009 | Arris 4 ft. Modem Cable (40384)

1 Answer

Online light off, all other line are on


i guess the above procedure msut work

Sep 28, 2008 | Arris SURFboard SB4200 Modem

2 Answers

MOTOROLA SB5100


Online Flashing - Scanning for a network connection.
On - Startup process complete. Modem aqcuired.


This means that your modem is not locked onto your cable providers network

Jun 21, 2008 | Arris SB5100 SURFboard DOCSIS 2.0 Cable...

1 Answer

Only 3 Lights Come on, Not online though.


That online light goes solid when your ISP completes the registration process of your modem. If this process fails, there are only 2 possible reasons. The first is your modem MAC address is not on your account with your ISP, which cannot be your case because it works on a different outlet. The second reason would be what is called ingress on the outlet. Ingress is caused by a bad outlet or more frequently a bad connector. Make sure inside your connector is clean and free of metal shavings. The problem you are describing is actually rare because usually if your having cable issues that cause a registration problem, you don't usually get a send light.

By the way, just because your tv works on that outlet doesn't mean your modem will. Your modem runs off RF frequencies that your TV doesn't come close to.

Jan 21, 2008 | Arris SB5100 SURFboard DOCSIS 2.0 Cable...

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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