What do you mean by "stopped working"?
Have you tried connecting it with a wire?
I have had the router for two years now. The port lights just started flashing constantly and that is why I am saying it just stopped working. I have connected the cable modem (which is my ISP) to the wireless device and that is when the lights start to flash. If I connect the laptop to the router at the same time that port light flashes and I can not access the internet. When I connect my laptop directly to the cable modem I can access the internet.
I was able to get into the router. however, the menu options were not quite the same as your I had to choose wireless setup to get to WPA setup. I entered the password XXXXX I previously used and had configured on my laptop. The message I see when I view the status of the connection it indicates 'waiting for the network to be ready'. The name of the network I setup previously was 'ccoppetti' I do not know if this has anything to do with the inability to connect. I changed it under SSID name but I am not sure this is accurate..