Fix For "This disk cannot be used to start up your computer."

1. Open Disk Utility

2. Click the hard drive with the Mac partition

3. Look at the bottom right because the partition map scheme should be "GUID Partition Table"

4. Click Partition

5. Click your Mac partition under "Partition Layout:"

6. Click - (next to the +)

7. Click Remove

8. Click the free space

9. Change the format to Mac OS Extended (Journaled)

10. Rename the partition to Macintosh HD

11. Click Apply

12. Close Disk Utility

13. Reinstall Mac OS X

14. If this fails, then open Disk Utility again

15. Click Macintosh HD

16. Click Erase

17. Click Erase...

18. Click Erase

19. Exit Disk Utility

20. Reinstall Mac OS X

21. Retry steps 1-20 until you can install