I connected my Airport Express directly to my cable modem via ethernet, and then my Mac found the Airport through the Airport Utility software(version 7.3.1). I then went through the setup, and the light on my Airport was solid green. I tried connecting to it, but it didn't work. I could see my Airport network connected, my Mac will even connect to it, but I won't get an Internet connection. It gets an IP address and everything. I've tried it on another PC and it doesn't work on that either. I can take the ethernet out of the Airport and plug it back into my old router and boom, it works. Any ideas or suggestions?