I have a linksys WRT54G router at home. It is less then a year old. I have 2 computers connected to it, one wired and one wirelessly. All of a sudden the wired computer can't get to the internet. This is my mother's computer and it's a mess. So I just save what she needs and reinstall the OS via the recovery CD's (the PC is an HP pavilion). So after that process I set it to automatically recieve an IP from the router. However it's not communicating with the router at all... I can't ping the router or anything. I checked the routers DCHP IP table and interestingly enough the router sees the computer, says it's assaigned an IP and it shows the PC's mac. So I doubt it's the cat5 or NIC causing the problems. And to confirm this I connected the PC directly to the modem and it works...

After doing this I decide to manually set the IP with the default subnet (255.255.255.0) and it still cannot communicate with the router. I also switched the port which the cat5 connects to on the router. Keep in mind this PC was able to connect to the internet through the router before... I'm pretty stumped... Any suggestions? It has to be something with the router but all of the settings check out... At this point I'm guessing that the router ports have gone faulty... which is pretty weird...