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Jun 14, 2014 4:28 PM in response to 5aad10by Carolyn Samit,Might be corrupted network preferences ..
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following:
/Library/Preferences/SystemConfiguration
Click Go then move all the files in the SystemConfiguration folder to the Trash.
See if that makes a difference.
Your Mac will generate a new SystemConfiguration folder for you.
If that doesn't help, try here > Wi-Fi: How to troubleshoot Wi-Fi connectivity