Macbook Pro does not recognize any drives on start-up

I was using my Macbook Pro (2012; Mountain Lion) when it froze. I manually shut down the laptop and restarted it. When it restarted, the screen was grey with a flashing folder with a question mark logo. This is the first time this has ever happened.
I tried restarting in Safe Mode (same screen appeared), resetting the PRAM, and rebooting in Recovery mode. In Disk Utility (in Recovery Mode), there are no icons for either Macintosh HD or for Windows (I have a partitioned hard drive). The only icon is for the Macintosh OS X Base.
I have an appointment with the Apple Store (a few days out) but was wondering if I could get any advice until then. Because I cannot access Macintosh HD or Windows, I was wondering if this was a physical issue (loose connector) or a decay of both hard drives.
Thanks.

Bad drive or ribbon cable to the motherboard. Your computer only has one hard drive.

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Macbook Pro does not recognize any drives on start-up

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