I had a vaguely similar issue a few days ago that they resolved, but in my case it was three lights that would not come on: System/Transmit/Receive. I had a 2.1.1 as well as a brief 3.1.1 error, but the 2.1.1 did not show until I rebooted the modem and it was unable to connect. With the System light off, I don't think there is any network access so they can not pull any diagnostics to see what is going on. After rebooting about 20-30 times I did get connected and they were able to pull the diagnostic data. Maybe try this: on the main page, http://192.168.0.1/#!/usage Click the "Built-In Self Test" link and tell them if anything failed. You should be able to do this even if the System light does not come on. I had a message "Cable Connectivity Failed" -- I think the hurricane two weeks back knocked the cable that runs out to the "nose" of the thingy on the dish loose, and the tech pointed out that the seal ring was hanging loose on the wire. Once he pointed it out I saw it too. In looking at it close up, I could see the weathering over the last three and half years had faded the color in the ring, and I guess made it more fragile. With that loose, water gets in there and messes things up, and can, in time, fry or shorten the life of the other electronic parts as the power for the thing on the dish is in there too, apparently. Of course, you have the Transmit/Receive lights on, so maybe this is something else -- like a tree blocking the line to the satellite, or dirt covering the sensor -- just trying to guess what would block access to the system if the transmit and receive are working.
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