Usually a problem after the update system ,
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If you can not enter the mac,
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chmod-R 755 mach_kernel
chown-R root: wheel mach_kernel
chmod-R 755 / System / Library / Extensions /
chown-R root: wheel / System / Library / Extensions /
rm - rf / System / Library / Extensions .*
rm-rf / System / Library / Caches / *
reboot
If you enter this mac,
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sudo
Password
chmod-R 755 / System / Library / Extensions
chown-R root: wheel / System / Library / Extensions
rm-rf / System / Library / Extensions .*
rm-rf / System / Library / Caches / *
kextcache-k / System / Library / Extensions /