Broadband Connection Problem?

"Do you have another ethernet cable to test with? Bad cables are rare, but it's possible.
I have to reset (power-off/power-on) my cable modem every time I switch devices, so make sure you do that.
Also, ask the techs to explain the looping problem to you and write down what they say here.

I know you used 3 different devices, but just to be thorough, double-check DHCP on your network card settings.

Start -> Run -> ncpa.cpl -> right-click your LAN adapter -> Properties -> Internet Protocol (TCP/IP) -> Properties

Make sure Obtain an IP address automatically and Obtain DNS server address automatically are both selected.

So it's this one? What happens when you connect via USB? Any way you can access the modem to see what's going on through that?

(^see question)

Here's something else to try. According to the manual nik linked, the IP of the router should be http://192.168.100.1 (pp. 25). Statically assign an IP for your LAN adapter.

IP address: 192.168.2.5
Subnet mask: 255.255.0.0
Default gateway: 192.168.100.1
Preferred DNS server: blank or 208.67.222.222 (OpenDNS)

Browse to http://192.168.100.1 and tell us if you get something."