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I tried to follow any guide but I can't find the solution for two problems I have: 1) When waking up from sleep fans start spinning but the screen stays black. 2) I can adjust the brightness from the settings but not with F11 F12 pressing any of those keys (also F8) freezes the system. I attach...

I am trying to install mac os Sierra on a Dell Vostro 3568, I followed the tutorial but when I try to boot mac os from the usb it gets stuck there and the usb key stops blinking.