I'am having some weird issue there... First of all, when my MBA runs out of battery for some reason it completely shuts down (rather than going into deep sleep). To add to that, I'am experiencing some kind of bug in latest version of Yosemite (14A361c) as it doesn't show the low battery warnings anymore. Long story short, my MBA ran out of battery, shut down, and now in OS X WiFi won't find any networks. WiFi is sometimes stuck in on/off state, it sometimes tries to search for the networks, but it never finds anything. I've tried "make service inactive" and re-adding the WiFi connection but it didn't help. What are the other options? Now I know for the fact that hardware is OK since I can connect to wifi networks just fine from bootmenu. It works from the windows too. It's clear that something's wrong with the OS X driver or it's settings, but as there is no windows like device manager (as far as I'am aware of) in OS X, I have no idea how am I supposed to reinstall it. Thanks in advance.