"It sounds like you've already tried everything. Just to double check, I'd suggest the following:
Unplug all cables from the router. Plug in the power cable. (Make sure you see lights on the router.) Wait 10 seconds (in case it takes time for the router to boot up). Press and hold the reset button on the back for approximately five seconds to reset the router. Connect an ethernet cable between your computer and ethernet port #1 (blue) on the router. Configure your computer to use a static IP address of 192.168.1.99 and a subnet mask of 255.255.255.0. Try to connect to http://192.168.1.1 in a web browser and see if anything from the router shows up.
If none of that works:
Try connecting the ethernet cable to another of the four ethernet ports on the router. Try using a different ethernet cable.
If none of that works, it's probably time to give up and pitch it.
However it seems very unlikely that it would fail such that it would ""act as a hub"" and pass traffic (DHCP packets to assign an IP address) from the yellow WAN port to the blue ethernet ports. The fact that you're seeing that behavior makes me think something else isn't hooked up like you think it is."
