I have a 3 months old retina MacBook Pro. it's been pretty much flawless. The only issues I had (still have) is that the wallpaper changes by itself after a reboot (so it won't save). Other than that, it's been good. The rMBP has a Samsung screen and SSD, so that's lucky. Here's the issue: Whenever I do a software update (through app store) or watch a trailer on let's say IMDB or Vimeo (not YouTube!) , I hear this hissing sound (softly, but it's there and in silent places obvious). It only happens while buffering for a trailer in IMDB or Vimeo and not for YouTube. Also, it doesn't matter if the sound is muted or not! I hear the sound above the keyboard but it also seems to be the speakers (muted or not, does not matter). Does anyone know what this could be? It's deadsilent otherwise.