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hello, i thing i need your help... after updating to last sierra, and last clover, everything was fine... but today, when i start on Sierra , the apple is coming on the boot screen, and it looks like the screen is going off... . if i boot with HDMI connected to my plasma tv, Sierra is working fine on the tv. it looks like the backlight on screen is going off..... i'm now on win partition . thank for your help .