Internal boot drive not mounted -- Mac does not restart

Hi everyone,
I've got a problem with my  2013 MacBookPro 13" with OS X 10.10 Yosemite.
It seems that somethings wrong with my internal boot drive. I wanted to start my Mac but the grey progress line stopped at about the half and didn't continue. I tried to boot in secured mode --> not possible. I loaded recovery mode and wanted to check and repair disk utilities but I cannot hit those buttons because my drive is not mounted and cannot be mounted. I also tried to connect my Mac via Firewire with another Mac in Target Disk Mode --> Drive could not be mounted. Finally I tried to mount my drive on a Windows and Linux computer --> not mounted :-(
Is there another possibility to mount my drive or to access my data somehow? The thing is that I do not have a backup and that is why I need to access my data and store them somewhere prior being able to do a clean reinstall of my Mac.
Thank you for your support.
Markus

Boot into the Recovery volume (boot with the Command + R keys held down), select Disk Utility and try to repair the disk and disk permissions. If you're able to reboot normally and see that works.
If not reboot into the Recovery volume and reinstall the system.
If you can't boot into the Recovery volume mamau08 may be right in that the drive has failed.

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