Turns on, but then turns off
I was watching an episode of my fav tv show when the screen of my macbook froze. So I held down the power button as I did many times before and it turned off. After that I waited 5 minutes and tried to turn it back on. The white screen with the apple symbol appeared to me and a little bar underneath, like the one that appears after you updated the system. It took an eternity to load everything. Then the users page appeared so I could enter my password, and so I did. After that it all turned black, but I could still see the little mouse arrow.
Now it just shows the white screen with the apple and goes immediately black.
What should I do? I already tried turning it on the safe mode but it didn't work out.
Will I lose my pictures, music and etc?
Please help me asap.
Is this a good question?