I will assume you have verified that you have the connecting cable attached properly, but have you tried another cable?
Cables are fine as well.. I was able to get internet with both cables I'm using.. (When modem is connected directly with my computer of course)
[this might be a double reply.. I signed up just now so that I wouldnt have delay in answering..]Cables work fine.. When I had the modem connected with my computer, I tried out both cables and both let me get connected..