WRT120N Router Stopped Connecting - Error Saying Wired Connection Was Not Automatically Repaired

My Linksys WRT120N router was working fine for all of 1 and 1/2 months and suddenly it stopped making the internet connection. At first nothing could access the internet but now that I've reset the router (via the little reset button in the back) my Kindle can access the wireless, but of course no password etc. I actually don't know how to put back the username and password for it. When router is connected: When I troubleshoot the connection by clicking on "Repair Connection" it takes about 2-5 mins "obtaining a new network address" then I get an error saying "The wired connection to your router was not automatically repaired. X Local network: Not connected.