What is the EFI boot option for mac, and why is my Mac having problems with it?

I just updated my 2012 Macbook Pro to 10.9, and I am having some problems with it. I have a bootcamp partition on it and regularly awitch between mac and windows, and 2when I went to switch nack to my Mac side, It said EFI boot nstead of the regular Macintosh HD. When I choose that option, the aple logo comes up and progress bar appears. Once the progress bar finishes, the computer shuts off and doesnt do anything. When I turn it on again, it just starts the efi boot again and shuts off when it finishes. Why is this happening and what can I do to fix this. All help is extremely appreciated.

That usually happen because the OS X partition got corrupted. Abiotu the only fix for that is to reinstall OS X and to do that you might have to completely erase the drive or repartition it as one partition. Which will wipe out the Windows side. So backup everthing you can before you start.
nisuteng wrote:
Hi, did you fix the problem?
I have the same problem... and my warranty has expired...
please help~~
thanks!!

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