I hear it whenever I stop writing. I am in a quite room. Obviously I m typing this right now on the keyboard, so I do not hear the scratchy vinyl sound, the sound the we are all familiar with in movies depicting life decades ago, life before the iPod, before digital music, when vinyl was synonymous to good music, hell was music itself. I can locate this noise: it’s on the left side of the keyboard. I put my ear down to the area. It is below the letter Q and W, I think. or higher, perhaps below the number 2 and the function key F2. With my ear on it like that, it isn’t scratchy noise anymore but a sort of insect buzz. What is this noise? The fan? Not unless it needs oiling. The processor? You hear the same sounds in your MacBook?