原帖由： macisgr8 ,
2013 Mac Pro runs much slower than normal and fan runs at full speed
Does anyone have a suggestion as to what could be causing this? I have zapped the pram but the trash can will shut down after the 2nd startup tone. I have removed all the ram and reseated them, had a brief problem with the ram stick not showing up in slot 1 verified by System Report. I have left it unplugged from power for 12 hours (while sleeping) and then held down the power on button for 10 secs. That did not seem to affect the bad behavior at all. Fan still at full speed. Ran the Apple Hardware Test which is built in, and it reported there may be an issue with the SMC Power Manager. I just ran it again and it comes up with the same error message: There may be an issue with the System Management Controller (SMC) Ref. Code PFM006 HELP, I don’t know what to do now.
Mac Pro Late 2013