Yosemite killed my wifi

[C(-)ris]

Chakravartin wrote:
1. Try rebooting;

2. Try a safe-boot-and-reboot (Hold down the shift key after boot-chime, then click the restart button when you get to the login screen and don't hold down the shift key on the second startup.);

3. Try zapping PRAM. (Hold down Command+Option+P+R immediately after rebooting and continue to hold down those keys through 4 boot chimes.);

4. If all else fails, remove the /Library/Preferences/SystemConfiguration folder and reboot. This will clear all of your network settings, so it's last resort for frequent travelers with a laptop that has a lot of WiFi and VPN settings to worry about, but for a desktop Mac is probably not too onerous.

Gold Star for Mac Resource Technical Support for the day!