How to Fix a MacBook Pro Airport Card That Loses Connectivity

Click the 'Airport' icon at the top of your screen, and select 'Open Network Preferences' from the drop-down menu. Alternatively, click the 'Apple' icon in the upper-left corner of your screen and select 'System Preferences' from the drop-down menu. Click the 'Network' icon.
Click the 'Turn AirPort Off' button, and click 'Turn AirPort On' to restart the program. Click the 'Advanced' button and click your wireless network in the list. Click the '-' button to remove the network, and click 'OK.'
Click the 'Airport' icon at the top of the screen and select your network in the list. Enter your password and click 'Join.'
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