I start up my early 2011 MacBook Pro, and it gives me the login screen, I enter my password, and then booting starts as normal, but about halfway through the progress bar, it stops booting entirely and comes up with this symbol.
I'm really not sure what to do. In recovery mode I'm unable to access the partition that holds the Mac OS (it's grayed out) and when I try to mount the Mac OS partition through terminal, it instead tells me that it's a FileVault or Fusion Drive - it's neither, to the best of my knowledge - and that it must be unlocked prior to mounting. So, U found the logical volume and unlocked it using diskutil corestorage command that actually unlocked volumes, and then it ended up as /dev/disk16, and I was still unable to mount /dev/disk0s2, or disk16. Trying to remove the empty Windows partition through DiskUtility results in failure because it's locked. Any and all help is greatly appreciated, as I desperately need this computer for study, and losing files on it is a non-option.