Could someone please listen closesly to the bottom of their machine and let me know if you hear anything? My new 15" Al PowerBook makes a faint, but consistent buzzing sound when the machine is put to sleep. If you put your ear right up to the case underneath the CD drive, you can hear it. The problem is, it never stops making the sound. I'm worried that it may be darining my battery prematurely in sleep mode. I'm not sure if this is a defect or if they all do it. Could someone please listen to theirs and let me know if you hear anything? I really appreciate your help. Thanks in advance.