If I'm understanding things correctly…you cannot boot the computer from that image. And the the Mavericks 10.9 OS should not have been deleted from the computer.
The process that should have been followed was:
- Don't delete anything from the computer.
- Boot the computer normally (OS 10.9).
- Download the Yosemite installer from the Mac Store
- Double-click on the Yosemite Installer…and let it do it's thing.
Easy.
If you somehow deleted the OS from the the computer (OS 10.9). I think that your going to need to boot the computer into the Recovery Partition (two key combo of command + r)…then reinstall the OS (most likely Mavericks).
Then the computer will be back to "square-one" to start things.
- Nick