Unable to turn on Mac

my Macbook pro was unable to turn on. It shows a white screen with block sign in the middle, provides me with no error message. Does anyone know whats going on with my mac?

If the error message looks like this:
Your MacBook Pro has experienced a Kernel Panic if the above message shows, in that case you should have it looked at by the Apple Store.
If you get this logo:
The MacBook was unable to boot into OSX, and likely needs to have OSX re-installed.

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