so my retina macbook pro has been making these crackling noises. the EXACT same noises on this guys video: http://www.youtube.com/watch?v=rx7Nwp9SE74 i got mine a few days ago, but the crackling has stoped and hasnt happened in the past 3 days. should i bother exchanging it? its either from speakers or fans, so i blasted music on my speakers from time to time to see if the needed to be broken in. thoughts on what it is and what i should do?