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Hi, I'm running el capitan 10.11.6 

I've problem in audio (alc270) not working and display flickering for some seconds when logging. Sometimes when scrolling the windows are black and the icons can't be seen. 

 

...any help really appreciated!

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it could be something stored in nvram. try sudo nvram -d in terminal command app to wipe it

Thanks,

I returned to version 10.11.6, because some things do not work on  10.12.1,in the  system preferences I can not access Displays and Trackpad

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