Downloaded Yosemite but it will not install on Macintosh HD as it says it is used for Time Machine Backups but it is not.  TM backup is to an external 2TB HD.  Downloaded OX x twice with the same result.

Downloaded Yosemite but it will not install on Macintosh HD as it says it is used for Time Machine Backups but it is not.  TM backup is to an external 2TB HD.  Downloaded OX X twice with the same result.

OS X: Cannot install on a volume used by Time Machine for backups
For some reason you have a folder called Backups.backupdb at the root level of the hard disk on which you want to install Yosemite.
Move it to the Trash.

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