SOURCE: 'How to fix flashing Power light on modem SB5100?
Check with your server.The registration details have been deleted.
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
SOURCE: 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.
SOURCE: Arris cable modem
if the power light is flashing then the modem is on battery backup and internet is disabled. plug the power cord into the modem or find a working power outlet, you should be set after that.
Power light flashing=bad
SOURCE: Power, Receive, Send flashes, No online light or the rest. Help?
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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