WiFi icon keeps blinking, can't turn it on or off Can't connect to Wifi on my phone, because the ON/OFF slider is grayed out:


Screenshot (click to enlarge)

Also, the WiFi icon keeps blinking, and I can't turn it on/off. Kinda frustrating.

Android Jellybean.
I solved it by deleting /data/misc/wifi/wpa_supplicant.conf.
It will reset all your saved networks.
I have it rooted and deleted the file through a root explorer or you can remove it via ADB (adb shell rm -r /data/misc/wifi/wpa_supplicant.conf. I'm not sure).

You may backup it before, then open with a text reader to see your saved passwords.