2012 Macbook and gray screen

Lately when I open my 2012 Macbook Pro, I get a grey screen with a status bar at the bottom. No just grey apple logo with the State Bar and startup sound. After a minute, my login screen is displayed, but the keyboard and track key are disabled. This fixes after a minute and one minute after the Bluetooth allows. Can someone tell me what is happening?

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You can try to use the steps in this article http://www.macworld.com/article/2018853/when-good-macs-go-bad-steps-to-take-when - your-mac-wont-start - up.html

Tags: Notebooks

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