My girlfriend recently bought a 17'' Unibody MacBook Pro (the one with the built-in battery). Yesterday, we noticed that the computer was making a noise from the left-hand side. It sounds like the hard-disk accessing information. Pretty much the sound all PC's make, however, we had never heard the machine make the noise before. She has had the computer for about 2 months. Our concern is primarily because my older 15'' MBP Unibody is virtually silent and never makes a similar noise. Is this something that should be checked out by a genius?