Laptop Not Connected to Internet?

I have been working with my laptop and the wifi it's connected to for over a month now. Just last night, it disconnected from the internet. It's not just explorer or firefox, but its completly not connected. But as you see, I must have internet to got to yahoo answers. I am on my iphone which is connected to the same wifi as my laptop was.
i tried turning both internet and wifi on and off
i tried restarting my laptop
i am not a computer master. u tell me what else to try.

in the bottom right, the little icon with bars has a rad X over it. click on it and it says: not connected, no connections are available, troubleshoot (its a link), open network and sharing (another link)
troubleshoot was being typical and didnt find anything.
when i click open network and sharing center, it shows at the top that "this computer X internet"
for active networks it says u are currently not connected to any networks. i click on connect to a network, and it goes back to that small window in the bottom right that said no connections are available.
i went to manage wireless networks and its showing my linksys. i checked and saw the password is correct.
i am stumped.
what else should i try?