When I put my ear to the Macbook Pro 13 I constantly hear the fan running (even when sitting idle no applications open). When I'm sitting up I can't really hear it. Just wondering if it's normal since it's always running. Is this a normal noise for Macbook Pros 2011 to make? Are you guys hearing this on yours when you put your ear to the case? I'm just concerned that it's constantly running even at a low noise level when I put my ears to it.