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Mar 18, 2016 7:07 AM in response to keg55by keg55,If the above reply doesn't work, try deleting all partitions so you have free space. Then ADD a single partition as Format: OS X Extended (Journaled) with the GUID Partition Scheme.
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Mar 18, 2016 9:02 AM in response to Mallcoinby Loner T,May I suggest... (apologies for jumping in keg55 )
1. Backup OSX and all your files - Use Time Machine to back up or restore your Mac - Apple Support .
2. Boot into Internet Recovery (Command+Opt+R) - OS X: About OS X Recovery - Apple Support .
3. Click on Utilties -> Disk Utility and Erase your internal whole disk.
4. Restore OSX and your files - Use Time Machine to back up or restore your Mac - Apple Support .
This requires a separate external disk which can accommodate TM backup - Backup disks you can use with Time Machine - Apple Support .