Problems after modifying the sharing permissions of the Macintosh HD

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ok, today testing macbook air file sharing feature pc linux mint. ok, noticed mac sharing macintosh hd folder too, decided modify sharing permissions of macintosh hd in mac. went wrong: linux pc stopped responding, had turn off hard way. mac crashed, turned off hard way. when turned on again , after logging in, loading screen stops responding:
[​img]
did mess up? how fix it, should try cmd+r? , please me desperated, thing not 6 months old (early 2014 model).
 

can remember how "modified sharing permissions of macintosh hd"?

should have done excluding folders don't want shared, , leaving in place folders need share. can through sharing pref pane. changing permissions hard drive (your macintosh hd) through info window hard drive unfortunate mistake if don't know doing.

if not sure how changed permissions, , won't boot, boot cmd+r, , reinstall os x. reinstall on have now, , won't lose music or other files , applications have added.
 


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