I just received a new Mac Pro as a graduation present. During the intial set up of the machine, I noticed it crashed a few times. As time went on, I began to notice that it would crash anytime it would be subject to some sort of disturbance or vibration. My brother and I did a few tests and found that after tapping or pounding the tower, it would crash. My question: what is the source of the crash? is this a hard drive related problem? This isn't a big deal since it is brand new. I can just get it replaced if need be but Id like to know now so i can take the proper precautions.