How Do I Reset the Sharing & Permission Setting on a MacBook? When you select the "Get Info" option, the mac will bring up a pop-up with the various attributes of the object selected. In the "Sharing &amp; Permissions" section, you can set the access level. 

I switched my hard-disk (MacIntosh HD) to no access, thinking that no one else except me has access. But I am getting locked out too. Right now, all I have is a black screen with the pointer. How do I get back access to the hard-drive?  Please note that the image above is taken from a network computer as reference.  It is my personal computer that I cannot get to.
Upon further review it may be best to use a recovery to fix this issue.