Macbook and iTouch don’t connect to the internet. Where’s the problem?

I have owned my black macbook for 2+ years. It has served me well despite laggish operating speed. I come back one day to connect to the internet on my computer and it doesn't work, but it has full signal. So I test my Itouch (gen2) and it has the same symptom...I tested the server with a different computer and it worked perfectly fine...Any thoughts?