Question about Arris SURFboard SB4200 Modem

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The activity light is off

The modem have all the lights on except for the activity light, i change the firmware with the blackcat and is the same what i should do?

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If your activity light is not on that usually indicates the connection to your pc isn't working. Have you checked your ethernet cable to make sure it's plugged in firmly? Also, if you're using ethernet, you may want to try reseating the network card. If you're connected to a router try bypassing it and connecting directly to the modem.

Hope this helps!

Posted on Jan 14, 2009

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Posted on Jan 02, 2017

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Related Questions:

1 Answer

When i plug it up it acts like its going to work goes through the motion all lights come on for a very short time the lights are right to left internet,pc link,cable link,cable activity and message all...


Disconnect the modem from the internet, your computers and anything else except power then boot it up again. Does anything at all change?

If nothing changes perform a soft reset... which prolly means leaving the modem powered up, poking a paper-clip into a tiny hole and whipping it right back out. When it comes on, does anything at all change?

If not either call the modem supplier or your internet service provider, or perform a hard reset; remembering that a hard reset will destroy all your settings.

Almost certainly, if a modem fails to work after a hard reset and following whatever advice your supplier or ISP offer, it needs replacing.

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THe sb4200 menu does not have "hack" option and I want to increase the speed of sb4200 modem . How do I do it ?


You need a blackcat kit you can buy online, comes with everything needed http://www.store.theoryshare.com/blackcat-usb-jtag-kit.html?___store=default

Aug 16, 2010 | Arris SURFboard SB4200 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

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All lights are on except "internet" light, can connect but light won't come on. Activity light flashes normal.


it doesint really matter if your connection works just get a new box thing and the light will be fixed i belive the price for one ranges between $10-$30 or so.

Feb 09, 2010 | Siemens SpeedStream Modem (4100) (SS4100)

1 Answer

Motorola modem sb5100 lighting up good all the way except for pc/activity light flashing at a faster rate then normal, is my modem bad?


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Aug 04, 2009 | Arris SB5100 SURFboard DOCSIS 2.0 Cable...

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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.....

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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

PC/Activity light


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.

May 03, 2008 | Arris SURFboard SB5120 Modem

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