Question about Arris SURFboard SB5120 Modem

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PC/Activity light SB5120 modem- All lights are on except the PC/Activity light, I get the notation on the task bar no internet connection?

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  • Anonymous Sep 03, 2008

    my PC/activity light sometime it stops flashing and flashing agian

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Check the pin connections. A damaged port can make all the difference. I had to realign with a screwdriver.

Posted on Jul 14, 2008

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Make sure the Ethernet cable going from the modem to the computer is secure. Then go to your computers control panel and clock network connections. Look in LAN, any try to find your connection. If it isnt there , than you will need to call your ISP, and they will install it all correctly for you at no charge.

Posted on May 12, 2008

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I have a Motorola Surfboard Modem sb5120 and i payed 200 dollars for the set up of it for internet i feel like a fool because i did not get to use it once after i payed for it because a storm knocked the...


1. 1st you must contact your Internet Service provider to see if your

connection is good.
2. getting in to the router and see the status of the router should be the

next step.
Since you don't have a pc this will be difficult because the pc has the

browser screen to see what is happening in the router. The interface

for the user is seen via the pc screen using the 19.168.0.1 IP address.
3. The gaming instruction or gaming setup instructions for your router

are in the "advance tab" the instruct set can be also abtained by going

to the manufacturers site.
4. To add devices to the Surfboard router you will have to either

connect with an Ethernet cord or you will have to set the router up

wirelessly for you device.
5. if you had a electrical surge at your apartment you may have

damaged the router to the electrical spike if no surge protection was

used.
6. to know if your router is ok the "power light" should be green
If you have flashing yellow lights on the "link" then you have lost

connectivity with your Internet Service Provider and you need to have a

router reset. ^The provider should be able to walk you through the reset

process.

Aug 27, 2010 | Arris SURFboard SB5120 Modem

1 Answer

All Lights are on...


If the Cable light does not come on and/or the Activity light doesn't turn on, there is a problem with the plant equipment and you need to contact your provider to fix it. It could be a cabling issue outside of the residence or something could be down at the plant itself. This can also happen when the temperatures rise or if there is condensation inside the cable as it causes signal loss and increased noise on the line.

May 31, 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

Constantly blinking Activity light


Well, you are very correct with the activity light blinking and the increased blinking except the fact that modem will encounter a problem in future...
The 5 different lights on your modem namely Power, Ethernet, DSL, Internet and Activity have their own indications and explanations.
1. The Activity Light indicates the amount of activity that is takin place on the computer on the Internet though the activity might blink even when you are not browsing. This can be explained by stating that the computer constantly keep sending signals  about it being connected to the internet and any other acknowledgements..

So, you've got nothing worry about unless the Power or the Ethernet or the DSL or the Internet light Blinks....
Cause they are the resultants of a fried modem(check for the adapter), faulty LAN connections, interrupted Dsl line and the account verification failure indications respectively.....

Dec 18, 2008 | Siemens SpeedStream Modem (4100) (SS4100)

1 Answer

Comcast modem


the light is flashing because your modem is working.

Dec 05, 2008 | Arris SURFboard SB5120 Modem

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