Mac OS X - Reinstalling Network Adapters
Note: You will need Administrative privileges on the computer to perform this action.
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Open System Preferences from within the Apple menu.
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Choose the Network option.
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Highlight the network adapter that is causing difficulties and press the "-" sign in the bottom of the left hand column.
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Click Apply in the bottom right hand corner of the page to apply these changes.
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It is strongly recommended that you restart the computer to apply these changes.
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After restarting the machine, open the Network panel by repeating Steps 1-2.
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If the adapters which you previously removed have not appeared, you will need to press the "+" sign in the bottom of the left hand column.
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Choose the interface of the adapter that you deleted prior to restarting your computer and click Create.
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After clicking Apply, this adapter should be added and functional once again.