Macbook won't start up at all, stuck on a black screen.

I went on my Macbook this morning, for about 20 minutes and then suddenly it turned off (whilst plugged in). I tried turning it back on but it wouldn't. It has charge (I checked the battery indicators) and help would be much appreciated as I have a lot of important information on there.

and how can I fix it without losing everything again?

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    Reinstall OS X without erasing the drive
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    and topics which may be similar to yours, are posted. Have you seen
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