Need help! MacBook Pro hangs, not bootable, no volume recovery

Hi guys!

I need some help here. My MB Pro (13",mid 2012, OS X Yosemite, 500GB SSD) crashed all of a sudden. I was not doing anything at the moment and it got a blackscreen. When I tried to reboot it, it says "A disc read error has occured. Please press ctrl+alt+del to restart". I looked that up in the internet and it can only be a command in Windows. (Yes, I have installed a Windowas partition with BC, size about 65GB) Then I tried to bring the mac into recovery mode pressing CMD+ALT+R. The spinning globe popped up and downloaded the latest "recovery files". (like this post About OS X Recovery - Apple Support) I already tried using the disk utility to repair the partition but I couldn't klick the "repair volume" buttons. Next I tried to reinstall OS X but the problem was that there was no Volume to choose for installation.
So what the heck happened here? lol
I would be very pleased if someone could help me solve this problem, I don't want to loose all my files (there are some important university files on it)
Thanks very much,
Greetings Gerit

It sounds like a drive problem has occurred, as the alert system said. When a read error occurs, it is possible that the Mac partition was damaged and that your system cannot find a Mac system to start. That's why the world of spinning appeared.

All I can suggest is to completely erase the disk, re-partition, then re-install OS X and Windows. Of course, if the disc is damaged you may need to replace everything first. You have a good backup?

Tags: Notebooks

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