I recently bought a new to me Mac Pro 5,1 and on opening it has more fuzz in it than a 70s porno movie. I dont think it has ever been opened. I gave it a quick blast with the air compressor - from about 2 feet as I was afraid I could damage it. Getting the hoover on it bothers me because of the static but then again I'm worried too much compressed air could damage it or drive the dirt deeper in. The CPUs literally had a beard each - maybe it's the ZZ-Top model - massive tufts of fluff growing out the fans. Amazingly the temps seem reasonable although I noticed in Mac fan Control app that the Intake fan is constantly at zero and marked in red. I have to get this dust off before I try fitting more ram - I did blow off the worst of it but it could really do with a more thorough clean - any advice? or do you think maybe the dirt is now holding it together - as my buddy calls it "load bearing dirt".