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This is a very intriguing problem. Every time I'll connect my MacBook Air mid 2013 with OS X Yosemite 10.10.3 to my wi-fi network at home, I can't, cause it won't be available in the list of networks available. What I do? I turn no my Android tethering hotspot, and only after I connect to this network, my home wi-fi will be shown.

What might it be???

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The first part is for testing.

You need to use the terminal and manually connect to it.

Turn On

networksetup -setairportpower en0 on

Find (you can skip this if you already know the Name)

/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport scan

Connect

networksetup -setairportnetwork en0 WIFI_SSID_I_WANT_TO_JOIN WIFI_PASSWORD

Enter/replace your WiFi name and password in the above.

This should have connected you to your Network.

  • In your Network settings your home network should be in the top of the list.

  • Open your router settings and change the network name to test if problem with naming. While in Router setting, change the channel to #5 (usually the least crowded one) to eliminate interferences.

  • Finally, run WiFi diagnostics, by holding the "alt" key and clicking on the WiFi icon, then selecting the WiFi Diagnostics.

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