On 29 Sep 2004, at 0:36, Andrew Kiang wrote: > I just upgraded my cube with a new WD Caviar hard > drive (80GB, 8MB buffer). I followed all the > directions in the Apple Support documents as well as > the Cubeowner tip about transferring the guide rail. > Now my Cube has a constant hum even though everything > seems to be firmly installed. It doesn't seem to > matter whether the hard drive is spinning or not. Any > ideas? Hmm, I believe I have the same drive in my Cube which cannot be heard, so it shouldn't be a drive. Do a quick test, put some soft material beneath your cube (a mouse pad would do) and see if it goes away.