No Internet Connection

I have bought a wireless router (Linksys WRT54GS) last night. I bought it so that I can share my internet connection at home with my laptop computer. After buying the said item, I excitedly go to our house to install the router. I follow the steps in installing the router based on the step by step guide on the CD. One of its step is to disconnect the internet cable from my PC to the router. Then one of the step in the installation is to detect if there is an internet connection. But the router didn't find any internet connection. :( I did all the that I can think of in configuring the router but still no luck. So I decided to put back my internet cable to my PC so that I can still used my internet. But the worst thing happen, my LAN detected a limited connectivity. It means I can't still connect to the internet even I put back my cable. So again, I did everything I can think of to troubleshoot the problem. And again, no luck. :( So I decided to just go to bed because there's nothing else I can do. Last night was my first night where I didn't access my internet.

Today, I'm planning to reconfigure it again based on what I've learned from my officemates on how to troubleshoot the problem. I'm hoping that I can solve the problem so that my PC and laptop and especially me can use the internet... :)