OS X El Capitan: If you can’t connect to a Wi-Fi network
If you’re having problems connecting to a Wi-Fi network, there are several solutions you can try.
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Make sure Wi-Fi is turned on. You can use the Wi-Fi status icon
in the menu bar to turn Wi-Fi on. -
You may be out of range. Make sure your Mac is within range of the AirPort Base Station, AirPort Time Capsule, wireless network, or the computer creating the network.
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The Wi-Fi service may not be available in Network preferences.
Choose Apple menu > System Preferences, then click Network.
If Wi-Fi isn’t in the list of network connection services, click the Add button
at the bottom of the list, click the Interface pop-up menu, then choose Wi-Fi. Name the Wi-Fi service, then click Create. -
If you are connecting to a wireless network created by an AirPort Base Station or AirPort Time Capsule, restart the device by unplugging the power cord. Wait a few minutes, then plug the power cord back in. After the network is available, try connecting again.