Hey everybody, not sure if this will help anybody, but i recently got a mac pro 3,1 that randomly restarts with the fans at full blast or just goes into a full blast mode. well i tried everything, stripping it down to its bare components and eventually just replace the thermal paste on both cpus as well as the chip to the right of the cpus and voila! it works perfectly. i am writing this paragraph on it now and it has surpassed the time that it will take to go into full blast mode. hope this helps someone!