Well Guys, I am mad, dissapointed and don't have confident on apple employees anymore to troubleshoot my mac pro. They cannnot fix it. I have taken to them four time already and cannot resolve the issue with fan running at full speed. I already had my mac pro for almost more than a year now. Thank goodnes i bought apple care on it, it will expire March 2014. Story of my Mac pro. 1. First the power supply was going bad and they replaced it with the logic board, and motherboard, also they forgot to serialize the motherboard. I was happy, Then the Fan problem started after that, Never had a fan problem before but until they replace the parts that's when the fan issue started. 2. 2nd visit they took it the fan did turn and run at full speed on them while troubleshooting it on the genius bar. So they took in for service. After they call me to pick it up couple of days later. So they said it is fix. I was happy, 3. Then a day later the fan started running at full speed when i was just browsing the internet. So i schedule another appointment with apple store, and it did run again at full speed at the genius bar. This time i told them If they don't fix it i will not take back and they will need to replace it with another machine. So the guy the guy told me they are going to fix it this time. So this time i called them and they said it was ready for pick up which was today 1/25/2013. So after work i when and pick it and got home 4. After i got home i plug in all my cables ready to work on some video that i needed to finish in Adobe premiere, Then suddently not even 5 minutes that the mac was turn on the Fan started running at full speed. I started @#&*#@ for couple of minutes and called the Store immediatly and i told them that i just pick it up and still the same problem fan is still running at full speed. This time i ask to talk to a manager and the manage showed up which younger then me i told him that i don't want to take this mac back and to replace it. I lost confident on apple and the employees that they can't fix this mac pro. I told him i want it replace i am not going to take it back because it is a bad apple defective unit. Then he said that the Senior Manager will have check it also. Then i told then bring the senior manager so i can talk to him. But he said he is not here today. So i told him what time will he be here tomorrow. I told him i will call tomorrow and request to talk to a Senior manager. Sorry for the lenghty story but i had enough with mac pro and i just want to throw it out of the window. I might just go back to windows again, Since i been having problem with the mac pro. So Guys any advise of what should i do next if they don't want to replace the whole unit.