Hi all, I see a few people have mentioned this but I'll chip in too. Just updated to 10.10.5 and on reboot all Bluetooth functionality on iMac has died. Icon has the wiggly line through it and says "Not Available". No Bluetooth devices are found in preferences. I've trashed the Bluetooth plist file and reset the SMC and PRAM but still no Bluetooth. How the hell do Apple put out an OS update that kills bluetooth? All was working 100% before 10.10.5. The only change was the OS update. I'm fuming. No gestures on mouse or anything now. Anyone any other ideas on how to fix this without taking it to an Apple Store? Not easy to lug a 27" iMac into a huge shopping centre.