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Change permissions on Mac OS X El Captain and the system won't even boot?! [Fix]
If anyone set this stupid 'No Access' to Mac HD like me, Here is the fix:
1- Boot into single mod by : Restart when you hold down Command and S keys
2- Enter each commands :
mount -uw /
chown root /
chmod 1775 /
exit
3- All set!
Credit to : dj-katchy
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