I upgraded to yosemite last night and it doesn't recognize my wifi. Can anyone tell me how to make my wifi work?

I upgraded my 2009 Macbook to Yosemite last night. On Lion my wifi was perfect. Now my macbook does not recognize my wifi. As a matter of fact, I can't even turn on the wifi. Can anyone help me?

Open the Network preference pane and delete the Wi-Fi connection from the list on the left, if it's present. Then add it back. If there is no Wi-Fi connection, just create one.

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