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I've just changed the Graphics card on my Mac Pro 3,1. I've installed a Nvidia Quadro FX 4800. Everything is fine, the only thing is the when I boot the Mac the classic grey screen with the Apple logo and a progress bar has disappeared. When pressing the button the screen is black and then it goes directly to the password screen. How can I do to make the silver screen return?

marked as duplicate by Allan, Tetsujin, IconDaemon, nohillside Feb 9 '18 at 13:55

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