Let's see what details about that machine are in your post. Sorry I can't find what make, model, OS and any story other than "it doesn't work." Yes you verified "it doesn't work" by moving it off the router.
Since no OS or much else to work with where to start but to have you reload the machine from it's Restore CDs? Maybe we could avoid that with more detail.
I have 2 computers connected to Linksys Wireles router (they are wired though not wireless). I have DSL by ATT/Yahoo.
Just recently 1 computer will not connect to the internet. It shows sending/receiving packets. When try to access internet, it just comes up with generic "The Page Could Not Be Displayed" message.
I am a novice at networking. I have called ATT/Yahoo support (no luck of course. I have unhooked router and hooked straight into computer. (what I did for one computer, I did for the other just to double check. The one that worked continued to connect and the other one not. So I know the router is good (changed to connect wireless and with other ports on the router and still not connect).
Any tips from those more knowledgeable?????????