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Dell 7447 won't turn off completely

I'm using a dell 7447 with newest BIOS A07 and Win 8.1 Home lastest update. 

The problem is it can't shut down completely ( black screen, led's keyboard on and fan run at full speed) when I uncheck "turn on fast starup" ( I don't want to use fast starup, it make my computer lag sometimes). 

Plz help 😞

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