回答“2013 Mac Pro runs much slower than normal and fan runs at full speed”Did you guys ever get a solution. I have had the same problem for 2 months. I have also found that for some reason mine seems to be temperature related which is either something to do with maybe the fans cooling the air and creating slight moisture. If I keep the Mac running at above 35 degrees C it will reboot OK. However if it drops below 29 degrees C it just won’t boot at all until I use a Hair Dryer to ward it up a little. Very strange that many people are getting this problem.