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Sep 23, 2015 8:40 PM in response to levqchiby leroydouglas,★Helpfulboot holding the command option R for Recovery http://support.apple.com/kb/HT4718
http://osxdaily.com/2014/12/14/reinstall-os-x-mac-internet-recovery/
You may need to re-partion
Having a back up is always recommended