It can happen that your Macbook starts acting odd… It doesn’t detect the airport card, it doesn’t notify the battery status properly or it simply doesn’t boot at all. Well, then may be you need to reset the PRAM and NVRAM.
To reset PRAM and NVRAM follow these instructions:
- Shutdown the computer
- Locate the following keys on the keyboard: Command, Option (Alt) , P, and R. You will need to hold these keys down simultaneously in step 4.
- Turn on the computer.
- Press and hold the Command-Option(Alt)-P-R keys. You must press this key combination before the gray screen appears.
- Hold the keys down until the computer restarts and you hear the startup sound for the second time.
- Release the keys.
Your computer’s PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.
Now you should see your wireless airport card again.