When I awake my MacBook from sleep, it make a weird sound, normally three times, with a 4-5 second pause between them. It doesn't sound like mooing, but it starts off low and goes high. All very quickly. It starts out in the left speaker and moves over to the right speaker... I have never heard this on any other Mac. Can anyone verifiy if they have heard this, and if so, what is it???? I was wondering if it is searching for the Airport signal... Even so, I have never, ever heard this sound out of any Apple laptop before.