I don't have a problem with this, I am just curious as to what it is. I have an iMac and a MacBook Air. And I have Find My Mac in use on my Air and Back to My Mac turned on on both of them. The weird issue: When my Air goes to sleep my iMac makes a woosh sound. Then, when my Air wakes up my iMac makes a different woosh sound. It does this weather my iMac is awake or asleep; as if my Air just takes over control of my iMac's speakers. But when my iMac goes to sleep or wakes up, there is NO sound from my Air, weather it is awake or asleep. ------------edit------------ There are other times that appear more random where my iMac will do a woosh noise as well. Though, it is unmistakable that when I put my computer to sleep and wake it up two different wooshes are from those actions. But I would really like to know what the others are, and if there is a way to silence it, or at least know what causes them, so they can become predictable and I can make sure not to do whatever causes them when I am watching a movie or show on my iMac. Because it is mildly annoying when I am watching something and randomly I hear, "woosh" in the middle of my show. Has this ever happened to anyone else? If I find other things that cause it, and/or if I find the root cause, I will announce it in this thread.