Default CM11 stable wifi greyed out i9505

Had CM11 installed ok and everything working well, not sure if I then flashed incorrect kernel or if a battery saving app has disabled my wifi. I rolled back to cm10.2 and still no wifi. I am a newbie so sorry and please bear with me, I have wiped cache, dalvik, factory reset all to no avail. Please help and apologies for my newbieness.

Andriod: 4.4.2
Baseband: I9505XXUFNB9
Kernel version: 3.4.0-cyanogenmod-g2ab6e0fbuild04@cyanogenmod#1 mon feb 24 16:07:33 PST 2014
CPU: ARMv7 Processor rev 0 (v71)
Cyanogemod version: 11.0-installerXNPQ09O
Build number: cm_jfltexx-userdebug 4.4.2 KOT49H installerXNPQ09O release-keys
SELinux Status: Enforcing

Many thanks

Matt