Why would my MacBook Pro be stuck on a Gray Screen?

Today when I went to start up my MacBook Pro the screen was completely black (it appeared to be lit but still a lit black), then I called Apple support and they walked me through a few steps, which just made the screen white. Along with the white screen it displays the Apple logo, then a circle with a line through it (like a do not enter sign), then a gray file with a question mark in it. These 3 images just kind of scroll through on repeat.
I am not really looking for ways to fix it, I do have an appointment with the Genius Bar, however I was hoping to just understand a little behind why this would be happening... And if you had any ideas on what the cost I'm looking at for the fix. I have a mid 2012 MacBook Pro that has been updated with the latest software. It was working perfectly fine yesterday, and I have never had any problems with it until this right now.
Please help and thank you so much!

Any one of these problems can cause Mac to not start properly.
Cannot finish checking the startup disk.
Cannot find the System folder.
OS X is corrupted.
Standard Troubleshooting steps are:
http://support.apple.com/kb/ts2570
Startup in Safe mode
http://support.apple.com/kb/PH14204?viewlocale=en_US
Repair Disk
http://support.apple.com/kb/PH5836
Reset PRAM: http://support.apple.com/kb/ph14222
Reinstall OS X
http://support.apple.com/kb/PH13871
Taking the computer to the Apple store.
Mac/ Intel Startup sequences:
http://support.apple.com/kb/ht2674

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You may see a prohibitory sign, or a folder with a flashing question mark on it.
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MacBook pro is stuck on the start screen, MacBook pro is stuck on the start screen

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Why would my MacBook Pro be stuck on a Gray Screen?

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