My computer doesn't start

Last night i turned my laptop off normaly, without any problems...
This morning, i tried to start it, but there was a folder flashing, with a question mark on it and i couldn't get to the star screen.
It hasn't been shook or something like that...
What's going on?? How can i fix it??

The ? mark means it can't find a boot volume on the drive. You could try booting to the Recovery HD, hold down Command+r keys when starting the system, and do a disk repair. If that doesn't work, either booting to the Recovery HD or the repair of the Macintosh HD after you boot to the Recovery HD, then more then likely the drive is failing/failed and needs to be replaced.

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