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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1 Answer

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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.

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


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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.....

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the light is flashing because your modem is working.

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Do a ipconfig at the command prompt and see if you are being assigned a ip from the modem. If not try rebooting the modem with the ethernet connected to modem and computer. then do ipconfig again to see if not getting internet ip, your card or modem eternet is bad. put in a new one and try again.

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