Has anybody noticed the kind of "hissing" sound, when a Macbook wakes up from sleep? Is this normal? PS: beware, plastic siding surrounding white macbook display is very prone to scratching I believe. mine came with small swirling scratches on one side of the display, out of the box, but it is only visible when direct light is focused on the area and at a 90-100 degree angle. because the plastic is somehow matted, under neon light or dimmer light conditions and when tilting the display all the way back, the scratches dissapear.