Macbook Pro Fails to Boot on Operating System

After Restarting My Macbook Pro 13" 2012 it repeatedly fails to boot up to Mac OSX but instead to OSX utilities. I tried to reinstall Mountain lion but it shows me that Macintosh HD is locked and when erasing it , it tells me couldn't umamount Disc. Any solution!!! Thank you

Found a solution. As expected, I needed to restore the firmware. However by just downloading the firmware update, OSX didn't want to write the firmware as it was already up-to-date. OSX has no way to know up-to-date but defective.
Found this thread:
https://bugs.launchpad.net/ubuntu-release-notes/+bug/774089
which lead to
http://pubmem.wordpress.com/2011/04/09/flash-efi-firmware-update-manually-on-a-m acbook-51/
that explains how to FORCE a firmware to be written.
I had to download this free software
http://www.macupdate.com/app/mac/16357/unpkg
to unpack the EFI udpate downloaded at
http://support.apple.com/kb/ht1237
I would say that a good command line knowledge is needed to process the above steps.
Hopefully I was able to find a solution before admitting that the logic board was defective and pay the 600$ for its replacement, as instructed by the genius at the Apple store. They are not allowed to process firmware restoration, but they should at least suggest it before proposing an expensive logic board replacement.
Good luck.

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