Unable to install OS X Yosemite on my Mac

I've downloaded the OS upgrade to my Mac and all seemed OK until installation. Now, I can't get beyond a screen that announces "OS X could not be installed on your computer. File system verify or repair failed. Quit the installer to restart your computer and try again."  Anyone have any ideas?

I Have the same issue with a different error msg. Gets to aboutb15 mins install then fails.
ive tried repairing disk (judging by the log the installer does this anyway during installation).
ive even tried booting from USB key with the installer on a separate volume, this produces the
same error. My files are still on the disk, It just won't accept Yosemite ans Mavericks seems to not be there
aanymore to roll back to.

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