The initial white screen doesn`t appear, but the computer starts normally.

Hi, I'm worried about something. I have a MacBookPro 15 ", and since yesterday when I turn it on, the initial white screen, with the loading bar, doesn`t appear. At first everything is black and then the computer turns on normally.` That is not normal, can anyone help me?

Yes, I normally get this white screen when I turn the machine on. Whithout seen nothing behind it. But now is not appearing anymore. I turn it on > everything goes black (should be white with the apple and the loading bar) > then the screen of the user and password to access the computer appears normally.
What can this be? I searched in the internet, and found nothing. I`m hoping to find the solution here.

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