Not my number one fan.

Just fixed a long term issue with my MacBook and thought I’d share the solution. I’ve been having excessive fan usage that, at times, sounds like the MacBook is going to take off at any moment but I never got around to looking into the cause until today.  On closer inspection in the Activity Monitor it seems that there was a rogue PowerPC process running that was chewing up 95% of the CPU and knocking the temperature to around 80°C. The culprit was something called ‘Authentication$’ and force quitting this process immediately dropped the fan down to a whisper and a steady 60°C.

I’m not entirely sure what the process does (nothing imedialty cropped up on Google) but i’m sure the process will appear again at some point (maybe after a reboot) at which point I will do further investigation as to the cause.  Hope this helps anyone else with the same issue.