Yosemite install a complete fail, how can I get my computer to work again?

i Tried to install Yosemite  and the computer (Mac mini) failed on the install.  Tried to restart and then unplugged.  Turns out some of the OS installed and can no longer get my computer to reach the home screen.  After starting the status bar gets halway and then stops.  How can I make my computer usable again?  Any help is greatly appreciated.

Hi Yosemitenightmare,
I'm sorry to hear you are having issues with your Yosemite install. If there was an interuption or failure during the initial installation and now your Mac won't start up successfully, you may want to try reinstalling the OS, as outlined in the following article:
OS X Yosemite: Reinstall OS X
Regards,
- Brenden

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