OS X: Gray progress bar, then MacBook shuts down

Hi Apple Community,
Last year I bought my first Mac ever for University and have been quite happy with it so far.
A few days ago I closed my MacBook when its battery was at ~2%. Normally when battery is that low when closing the MacBook it usually goes into hibernation instead of sleep. When put it on power again about an hour later and opened it again it wouldn't start properly. When I try to boot it now, I see the apple logo with the rotating thingy and a progress bar which fills up in about 5 or 7 minutes. After the bar is filled up the MacBook shuts down and I have to do it all again. So the computer never starts.
I did some research on the subject but all of the solutions couldn't help me. Internet recovery doesn't work, because it doesn't allow me to connect to my university VPN (which is necessary to use in uni accomodation). I also don't have a Recovery CD.
When I start Disk Utility (Cmd + Alt + R + P or something) it won't work as well and just tell me that the Macintosh HD "could not be repaired after three tries" or similar.
HOWEVER: It can't be a hardware problem, because I'm running Windowss 7 via bootcamp (from where I'm writing right now) and everything seems to be alright on here.
My Mac:
MacBook Pro 13" (mid 2012) running on Mavericks.
I'd really appreciate anyone who could help me. I have all my important files synced to my dropbox, but I don't really like the idea of reinstalling OS X
Thanks in advance,
Luka

Guess that's really my only option, thanks. I thougt OS X were indestructible.

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Attention! Peculiar recurring MacBook Shut-Down Behaviour!

After using Macs my whole life, this is the one situation that truly baffles and peeves me greatly ...
I have now owned a 2GHz Macbook (running 10.4.7) for about two months. When I go to shut the machine down, (primarily by way of the apple icon in the menu bar) the screen goes black like normal, and the computer appears to shut down normally. However, for some reason, once the lid is closed, the sleep indicator light turns on and pulses as if its sleeping. At this point, however, if the lid is opened and a key is pressed, the computer will not wake back up. The white indicator light will simply turn off and the screen will just sit there—black. At this point, seeing no other viable options, I usually just resort to holding the power button down for about 10 seconds to make sure the computer is off. I then open and close the lid, and, if the light remains off, then I know its fully shut down. When I turn the machine back on, I am greeted with a message that says "the computer was restarted after Mac OS X unexpectedly quit." I always send this report back to apple with a description similar to what I am writing here. After the 5th occurence, I called Apple. They had me reset the PRAM, boot with the install discs and repair the disk. They said they had heard of similar incidents (as I have) but none quite like this.
As a college student, I do everything on this machine and would be crippled if I had to send it away for repair. That is why I urge you, implore you—beg you!—to come up with a possible answer to this problem.
ps. I have heard of a possible correlation between this problem and the amount of time one waits before closing the lid after shut down ... They say you have to wait at least 10 seconds before the computer will actually shut down. Well, I wait a good 30 seconds each time, and the problem still remains ...

Hi, sydbarrett. Welcome to the Discussions.
1. You wrote: "ps. I have heard of a possible correlation between this problem and the amount of time one waits before closing the lid after shut down ... They say you have to wait at least 10 seconds before the computer will actually shut down. Well, I wait a good 30 seconds each time, and the problem still remains ..."You are referring to the article "Wait for your Apple notebook to fully shut down before you close the display." The article does not specify a wait time before closing the lid, but states the conditions one should observe indicating that the computer has shut down.
2. Some Intel-based Mac post-sleep behavioral anomalies have been resolved by removing the sleepimage, as follows:2.1. Start up from your Software Restore DVD usually labeled "Disc 1" or "Install Disc 1."
2.2. Select language. The Installer window then appears.
2.3. Select Utilities > Terminal
2.4. At the terminal prompt type the following exactly as written:
sudo rm "/Volumes/Macintosh HD/private/var/vm/sleepimage"
then press Return. Note that if your startup disk is not named "Macintosh HD", substitute the appropriate name.
2.5. Type your Admin password if prompted, then press Return.
2.6. At the Terminal prompt, type exit and press Return.
2.7. Quit (Command-Q) Terminal. Focus returns to the Installer.
2.8. Quit (Command-Q) the Installer. Select Restart.3. You wrote: "I urge you, implore you—beg you!—to come up with a possible answer to this problem."Apple may read, but invariably never responds to posts here. Posts made to these forums are answered by other users.
Unfortunately, if the advice above does not help. I suspect you will need to have the machine serviced. If there is an Apple Retail Store in your area, I'd recommend taking it there. You may wish to call ahead to make an appointment at the Genius Bar.
MacBooks have had a variety of shutdown-related errors reported, e.g. "MacBook: Shuts down intermittently ." You may want to search the MacBook Dicussion for similar reports.
Good luck!
Dr. Smoke
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Sounds like a buggerd battery chip. If the MacBook turns off at a certain percent all the time, then your battery's status chip is damaged and is (quite literally) lying to Mac OS X.
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OS X: Gray progress bar, then MacBook shuts down

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