1. Go to System Preferences > Network.
  2. Click the Wi-Fi connection.
  3. Click the Advanced... button on the bottom right.
  4. Click the Wi-Fi tab.
  5. Under Preferred Networks, select your wireless network.
  6. Click the - (delete) button.
  7. Turn off your Wi-Fi connection.
  8. Turn it back on.
  9. Select and login to your wireless network. This will re-save your connection under Preferred Networks.
  10. Close your laptop and reopen it to test whether it worked.
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