My airport express light is green but my computer still can't detect the internet
I recently got an Airport Express 802.11n Wifi system, which I'm hooking up to my Macbook 8,2 and an ethernet cord I got hooked up from Charter, and although I have a solid green light, my computer still struggles to connect to the internet although it seems like everything should be going ok. I already took my airport and Macbook to the genius bar and got some help reconfiguring some of the system preferences, yet it still didn't help unfortunately.
Any advice would be very appreciated ! Thanks so much.
Airport Express-OTHER, Mac OS X (10.6.7)