MacBook pro won't start - start progress 99% and stops

I have problems to restart my MacBookPro.

The last time I used it I made a stop down and done okay.

Now that I'm trying to start it, it shows me a screen white background with Mac logo and in the background a startup progress bar that goes from 0 to 100%. Before we get to 100% (looks like 99%) it stops. Whenever I'm trying is the same process.

I appreciate your help to find out what I can do to finish the boot process and start my macbook

Thank you very much!

Boot into Recovery and try to launch the first aid/repair disk

Recovery http://support.apple.com/kb/HT4718

Tags: Notebooks

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