All the above answers are wrong, let me fill you all in on the color code here. White means you are connected to the access point but it is in a state where there is no data feed whatsoever to the internet. To test this you can set up an ad-hoc network but do not share a wired internet connection to your router. Once you enable internet sharing the connection will go green. 3G does the same thing if the network is having issues. Happens often where I am.
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