Black screen after Mavericks update ?

Hi everybody,
First of all, I want you to know that I'm French so I want to apologize for my potential mistakes
A few weeks ago, I updated Mavericks (because my mac told me to do that every single day .. ) on my Macbook Unibody bought in September 2010.
After that update, I had a black screen after the "Apple logo" and couldn't do anything. I went to a Genius Bar in Paris and the technician told me that the unique solution was to format the laptop. I decided to accept this because I needed my laptop for work. However, I lost all my data (documents, pictures ...)
Apparently, I'm not the only person in that case and the problem comes from Mavericks.
So I want to know if someone else is also in that case, and I think that it's unacceptable that Apple does not communicate about this.
Thank you

Connect the MBP to a monitor.  If the monitor fails to produce an image, the GPU is suspect.  If the monitor produces an image, the display or the display connection is faulty.
Ciao.

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    Connect the MBP to a monitor.  If the monitor fails to produce an image, the GPU is suspect.  If the monitor produces an image, the display or the display connection is faulty.
    Ciao.

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