I Got My New Mac Pro on Friday (2.66Gz, 8gb Ram, X1900XT), with all apple factory Parts. Ever hour or 2 the side case seems to come loose and starts vibrating loudly. sometimes if i just hit it (In a loving kind of way) it locks back on properly, other times i have to take the panel off and then return it to its place. Always it Keeps coming off . The IT guys at work can't work it out either... Any ideas on how to fix this?