I have a MacBook Pro mid 2012, and I have installed Yosemite Beta when it was released. It was working fine till yesterday when suddenly the system hung up. After a restart it crashed again and during next restart it showed that the error was with launchd process failing or something like that. When I restart it again, it doesn't show the Apple logo, but it now shows the blinking folder icon with a question mark, like this. Here's the thing: I have some files in the system I want back at any cost. I don't have time machine backups... I needed some space and I used the time machine disk for that. It hurts now... :/ It looks like my recovery partition doesn't exist at all as nothing comes up when I restart with Cmd + R pressed. If I try booting with alt key, this is what it shows: Tried a NVRAM/PRAM reset, and didn't work. When I connect to a network and try Internet recovery (which I am not sure whether I should do or not if I want my files back), it shows this: I have tried booting from Ubuntu live USB (which was readily available), but then it doesn't even show the Mac disk among those partitions. Only the live USB shows up as /dev/sda, but there's no /dev/sdb or anything at all. It acts like theHard disk is not connected at all? How can I fix this? My number one priority is to get my files back, and then reinstall OS X. I have a Mavericks image, a USB drive and another laptop with Linux and Windows in it. Any ideas?