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Helpful answers
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Aug 25, 2016 5:55 AM in response to Tedunby macjack,Have you tried unplugging modem and router then rebooting (modem first then router)
See these Apple Support Topics:
https://support.apple.com/en-us/HT202222
(This was written for older OS X systems but updated in 3/18/2011 and is a pretty good troubleshooting guide.
Basics connecting to wi-fi:
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Aug 25, 2016 8:40 AM in response to Tedunby Eric Root,What does Wireless Diagnostics show?
Wi-Fi Problems in OS X Yosemite
Wi-Fi Problems in OS X Yosemite (2)
Wi-Fi Problems in OS X Yosemite (3)
WiFi Potential Temporary fix - Yosemite
Also try turning off Bluetooth.
WIFI AND BLUETOOTH FINALLY SOLVED, NO REALLY - YOSEMITE 10.10
If your Wi-Fi source is capable of generating a 5 GHz Wi-Fi network, try that to help avoid conflicts with Bluetooth.

