Hello there, Ive noticed that my powerbook seems to make a barley audible but regular "beep." Interestingly enough, I've found that when you unplug the power adapter (ie: running on battery) this noise is not present. Furthermore, I only notice it from time to time. This could be because it is so low of a sound that you need to be in nearly complete quiet to hear it, but none the less. I am wondering what it could be. Given the nature of the sound and its interval, I would assume it is there for a reason. I know, for example, that my old PC would make beeps when starting up that indicated the status of the system based upon the length and number of the sounds. Could this be some kind of warning or indicator? I dont think the computer should normally make this sound, as it does become somewhat distracting when you are typing up a document in silence. I really should emphasize again, however, that this is a very low noise, probably about as audible as a particularly loud wrist watch ticking. However, the noise does bear an uncanny resemblence to the sound that microsoft office (4 windows) paperclip makes when its tapping on your screen, for what thats worth. Maybe this is why the noise irritates me so much, because it reminds me of that annoying bastard. To make things simpler, my computer is a late model Powerbook 17" with the 1.67 GHz G4, a gig of ram (512 of which came from crucial) and the 128 MB vid card. I should note this is the revision that came out right before the latest one (ie: it has the screen resolution of the current 15"). Thanks for your time.