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Try using cmd + R during startup and booting to the Recovery HD. Booting to Recovery HD. Open up DiskUtility from the menu and you should be able to access the drives and re-partition them and restore the OS again.


Boot into Recovery HD, open Disk Utility. Choose Yo Drive in the list and select the Restore tab. Make Yo Drive the Source and Macintosh HD the Destination. This will erase all content on Macintosh HD and replace it with the contents of Yo Drive. Back up anything important on Yo Drive before hand in case of failure during the restore. After that you ...

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