You can erase free space in Disk Utility to overwrite your deleted account to prevent it being recovered. It would just leave some cache and log files. Most of the user data and preferences are in your home folder so creating a new admin user account in system preferences > users & groups, logging into it and deleting the old user will set it almost back to how the system was new. Installing this would create a recovery partition. Then you can open Disk Utility, erase the drive and reinstall OS X.Īnother route you can go is to open the Mac App Store and install the latest Mac system, which will be Yosemite at the moment. The USB stick is probably your installer, which you should be able to boot from by holding alt/option at boot. The command-R only works for 10.7 or later, which created a recovery partition.
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