I just purchased a macpro 4,1, I upgraded to the last firmware to 5,1. The machine was VERY dusty, which I blew out with compressed air as best I could. I think the machine was not used an a very long time. Note: I live in a very humid climate. The machine runs fine but generates a very musty or musky smell. Anyone else experience this with older machine, and what did you do to over come this. I am thinking to let it run with some workload to help burn off or dry out. I will do a more through cleaning also. Thanks