My iMac 2019 is randomly shutting down and sometimes have kernel panic where I cannot boot it up also. When I successfully booted it up and entered apple diagnostic mode it returns the error of ppf004 with error of ppf003 which is suspected to be a fan undetected error. The problem is checking with Macs fan control I can see that the fan is not running but the temperature of the computer is just like ~66℃ which means the computer should not be randomly shutting down due to overheating. Is there any possible reason the computer is having such issue? Many thanks.
