Question about Arris SURFboard SB4200 Modem

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I have a motorola sb4200 cable modem that was working just fine until 3 days ago the power light is steady and the send and receive lights alternative in blinking and being steady none of the other lights turn on. i have unplugged and re plugged the modem several times from all wires and connections. i checked the wires outside to make sure the connection is right i also have a netgear routing connected to it that is working.

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Thank you for the detailed information. Not having internet can be frustrating! If the "Online" light is not turning on, that means it is not obtaining an IP address from your internet service provider. Since the "send" and "receive" lights are blinking, this means the coaxial cable (Tv cable) is screwed in.

I would suggest finding a phone number for your internet service provider to assist you further. There may be a service outage in your general area, or there may be a localize issue. They may have to go through troubleshooting with you over the phone, so you may have to unplug the modem, and maybe even bypass the Netgear router to troubleshoot with them. If the issue cannot be resolved over the phone, they may need to send out a repair man to resolve your issue.

Posted on May 26, 2011

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1 Answer

I have the Motorola surfboard SB4200 modem. THe lights are not on: only the power light is solid and the receive light is blinking. Any suggestions?


Phone your tel company and ask them to check your phone line for faults.Then check your leads or replace them.Uninstall the modem and reinstall it through the disc that came with it.

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Throw it away or send it to Motorola they get very HOT and this causes failure its common in routers and modems

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change the last four digits on the mac 192.168.100.1

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There are plenty of aftermarket Cable Modems for sale at most major retailers (Best Buy, Target, Walmart, etc..)

I would go and buy a decent one of these and try it out to really test to see if the modem is indeed the issue here. If the new one works and doesn't drop the connection anymore then problem solved. If however the new one does do the same thing I would check for proper venting area (make sure you don't have anything on top of or burying your modem) first. If that's fine then it could possibly be issues with your actual line and in that case you'll need to harass the cable company until they actually send someone to test your lines.

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try to unplug it and the cable for a few minutes, then replug it and see if that helps.

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Power Cycle the modem if the 4 lights do not go solid you would want to contact your cable provider to ensure signal is being received properly to modem.

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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.
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  • 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.

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