iMac not reboot


when reboot keeps black screen , white cursor , nothing else.
if restart sudo terminal, works fine.
in syslog have seen line repeated time when looks this
mdworker[604] <error>: libcoreservices: _dirhelper: 595: mkdir: path=/var/folders/zz/zyxvpxvq6csfxvn_n00000b400002s/0/ modes[0]=0755: operation not permitted

can do?
 



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