My MacBook won't start up after downloading new iOS

I finally decided to download the newsy update for my 2012 MacBook Pro, which I believe to be the iOS x Mavericks (? not 100% sure, just whichever is the most recent, I think before Mavericks it was Mountain Lion) and it downloaded and restarted, but was stuck on the start up white screen with apple logo. I forced shutdown and then tried to start it again, in which it was stuck at the start up screen again. I then forced shutdown and tried a safeboot with the shift key but even before the safeboot bar is even 1/10 of the way down, it shuts down again. This happens every time I try to power on or safeboot. I'm unsure exactly what the iOS disc that supposedly came with the notebook is, and so I'm unsure of what to do next, any help would be appreciated thank you!

If the Safe boot has failed, I see two options, one is to try and reinstall the original OS or two take the MBP to an Apple store genius bar for a free evaluation.
https://discussions.apple.com/docs/DOC-6162
Ciao.

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I follow the robotobi post and solve this issue.
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My MacBook won't start up after downloading new iOS

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