I have a MBP 13" early 2013 / Mountain Lion 10.8.2 A while ago I got a spinning wheel right after starting my mac. I contacted Apple since my mac was still under warranty, and after further diagnosis, they told me that I have to replace the HD, so they mail me a new HD. I connected the new HD using a USB cable to format and re-partition it using disk utility (At this point, DU was able to see the HD on a USB connection). After partitioning, I removed my Mac cover to replace my HDs. I booted using a Mountain Lion USB drive, but the installer couldn't find the new HD, just the recovery partition. I bought a new HD from Amazon, same result, my mac can start with teh old HD. Also, the disk utility can read the new HDs if they are on a usb connection, but it cant read them if they are on a SMART connection ! I deeply appreciate any suggestions ! I'm really stuck..