How can I fix my macbook pro, which does not start?

My macbook screen lights up, however, after loading 2 thirds of the bar, the apple logo becomes a circle with a cross inside. My software is el Capitan.

Before this incident, I tried to save my photos on an external hard drive. Yesterday I tried to save the photos on an external hard drive using the finder, and I let him sleep through the night and to complete the process. My mom she used last night, and it started to freeze when I tried to change user, and he has not responded to my cursor (which I could move). That's why I force quit the Mac. At this point, I had also disconnected the hard drive (probably my fault). When I re-started the situation with the circle and a cross appeared and it has not changed since.

I would be grateful if someone could help me solve this problem, even if it means send to apple.

Thank you very much.

Harry

On the screens, you see when you start your Mac - Apple Support

Hope you have a backup.

Reinstall OS X from recovery

https://support.Apple.com/en-us/HT204904

Tags: Notebooks

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