My brand new MacBook Pro will connect to my wireless network, but can NOT access the Internet. Other computers on the same wireless network can connect to the Internet.
I had tried the standard rebooting of the computer as well as removing then adding the specific wireless network again, via System Preferences>>Network >> Advanced Settings. Neither helped.
The solution was to completely remove the Airport/Wi-Fi interface and then add it again. As follows:
• Open: System Preferences>>Network
• From the left, there is a pane listing interfaces (Ethernet, VPN, AirPort, etc.)
• from the the bottom of the pane there are (+)(-) buttons
• Highlight: AirPort and press (-) to remove it.
• Press the Apply button on the bottom right.
• Press (+) and choose W-Fi (AirPort) for the interface type.
• Click: Create
• You should be good to go, I was.