Problem

You are unable to connect or see any available wireless networks even when wireless is turned on.

Applies to

1. Mac OS
   

Resolution

Please try solutions in sequence trying to connect to wireless after applying each solution.

Method 1 - Restart

Restart your MacBook and where possible the wireless router or access point. Then try reconnecting afterwards.

Method 2 - Open wireless diagnostics

1. Hold down option key and click the wireless symbol in the top menu bar.
2. Then select “Open Wireless diagnostics”.
3. Then click “Continue” and follow the on-screen instructions.
   

Method 3 - Forget problem wireless connection

Before carrying out these steps make sure you have the credentials to log back onto the wireless network. These are usually printed on a domestic router.

1. Click Apple symbol > System Preferences > Network.
2. On the left menu click “Wi-Fi” and then click the “Advanced” button.
3. You will now see a list of preferred networks, select the Wi-Fi network you are unable to join and then click the “-“ minus button to remove it.
4. Then click “OK” and “Apply” buttons.
   

Method 4 - Delete configuration files

1. Close your Wi-Fi from MacBook
2. From menu bar select -> Go -> Go To Folder.
3. Then paste this address /Library/Preferences/SystemConfiguration/
4. Locate and delete these files and delete them:

com.apple.airport.preferences.plist
com.apple.network.identification.plist
com.apple.wifi.message-tracer.plist
NetworkInterfaces.plist
preferences.plist

5. Now shut down and restart your MacBook.
   

Method 5 - Reset non-volatile RAM (Intel)

1. Turn off your Mac.
2. Locate these four keys and do not press them yet: Option, Command, P, and R.
3. Turn on your Mac and immediately press and hold these keys.
4. Keep holding them for 20 seconds. Then release them. This will reset PRAM or NVRAM. This will reset some of your settings such as display, volume, time zone, etc. Open