this will be factory reset and if you want, you can upgrade to Yosemite once it's setup using the Mac App Store then you can reinstall 10.6.8 from the USB pen erase the internal drive and if you want to prevent any file recovery, choose to zero the drive in security options with the lowest security option boot holding alt/option with the USB drive in, boot from the drive and open Disk Utility Given that you have the USB pen, using that would probably be the quickest route if you want do a full reset and make sure no personal data is recoverable: You don't have to worry about the system itself, it doesn't get cluttered over time like Windows. You can use this method of just making a new account if you aren't too bothered about possible recovery of files or personal data. 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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