Prohibitory Sign / Bootable device grayed out in Disk Utility
Hello guys!
Yesterday as I was listening to music on my MacBook Pro 12 it restared and I received the prohibitory sign.
In recovery mode I tried to recover the drive but it won't show.
In Disk Utility I ran First Aid on the drive and everything was OK. Than I ran it on the Yosemite partition (which was grayed out) and it won't finish the operation
Is the data on the drive gone for good? Its really important.
MacBook Pro, OS X El Capitan (10.11)