Set sharing on system to read only now computer wlll not boot up

set sharing on system to read only now computer wlll not boot up

Hello skiboat2, 
Because the permissions have been changed, you will need to put them back to what they were before. One of the ways to do that is to reinstall your OS X to make sure that everything permission wise gets put back to what it needs to be to work properly. Based of to the operating system that you say you have, I have provided the steps for reinstalling Snow Leopard. When doing this, it does not overwrite your personal data; it only touches the operating system. 
Mac OS X 10.6: Reinstalling Mac OS X
http://support.apple.com/kb/PH6606
Regards,
-Norm G.  

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