TS1440 A flashing question mark appeared when I started my MacBook Pro, I've tried all the suggestions and nothing has worked. How can I back up my current files so I can reinstall Mavericks?

I recently did a manual reboot after my MacBook Pro had frozen, and instead of the usual Apple and loading icon, it gave me the flashing question mark on a folder, which I've never encountered before. I looked up some possible reasons on my PC, and after reading that there's a problem with my HD I tried looking up how to back up my files so that I can do a clean reinstall of Yosemite (latest ver.). However, I've never used anything like Time Machine or anything else that could back up all my files, so it didn't sound like I could do anything about that at this point. I've also tried going into Disk Utility and attempting to repair the disk image. There was only 2 available, disk0 and the base system. I verified the base system, and told me there was nothing wrong (it didn't give me the option to repair anything either, on both available options). I don't think this is the right thing though, since my drive was called MacBook Pro HD. So basically this is the point I'm at now. Is there anything I can do that will repair my HD without erasing all my files?

I've tried all the suggestions and nothing has worked.
I verified the base system, and told me there was nothing wrong
Hold the option key on boot to see if you can select your Macintosh HD.
A flashing question mark or globe appears when you start your Mac - Apple Support
You can boot into Recovery and re-install the OS X on top of what you have.  It will preserve your user data.
command R on boot.
Recovery  http://support.apple.com/kb/HT4718

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