Just got my replacement retina, the 1st one has dead pixel. I have restored everything from time machine. Everything is fine. But when I run iMovie and scrolling thru the HD thumbnails from Aperture library, it makes this jerking or stuttering sound from the computer. It sound kind of like hard drive reading noise, but isn't SSD supposed to be silent? I also have 25000 photos on my aperture, and it's silent when I scroll thru photos and videos.