Mac partiton not starting up, stuck on Apple logo.

I am using a mid-2012 MacBook pro. I was using Yosemite when it started having issues.
For the past few months I would have a grey loading bar on startup that would go away in a minute or less. This past week my Mac started running incredibly slow, freezing on every window. I tried to install updates in hopes it would fix it. However, after updating it would take minutes to boot, then it stopped booting.
I tried RAM, hardware resets. Everything. I tried to reinstall Mountain Lion, now after the download/install all I have is the Apple logo and the cursor.
However, the Windows partition works totally fine..
Any ideas?

I tried all the usual options - safe mode, resetting PRAM, etc, plus a few others I'd not known prior - recovery mode, etc.  Nada.
I couldn't even get mine to start from a CD.
I went the Genius Bar at the Apple Store - they were able to run Disk Utilities, then Disk Warrior and fixed some minor issues, plus "blessed the hard drive" - in the end, however, I ended up needing the operating system reinstalled.
The folks at the Genius Bar earned their rep for being extremely helpful.

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