over the past few weeks i have heard a high pitched whine in my house and i couldn't seem to find the source. Today i leaned down to pick up something off the ground and my ear was level with my macbook and i heard it! coming from the top left corner of my keyboard there was a very high pitched whine. not fan noise, a deafening ring. anytime i type a key or move the mouse it goes away, then the second i stop mousing or typing it starts again... i've tried restarting. googling around and i didn't find anything? should i call applecare about this? or is this a common problem that is non-fixable?