i searched all the threads, but i couldn't find this exact problem (some related ones). i'm finding that even with my sound turned all the way off, i can occationally hear a popping noise from the speaker. it is kinda like the sound you hear when your ears clear from altitude. i get it with lots of things. one thing i've noticed is when a growl notification pops up. it really is quite faint... it has to be very quiet in the room to hear, but it is definitely there. any ideas? similar experiences?