MacBook Pro won't mount internal HDDs

I have a mid-2012 MacBook Pro that has been awesome for me, until last weekend, when it stopped booting up.  I get the grey screen with folder icon and flashing question mark.  I booted up in Internet Recovery, but the OS couldn't write the backup to my HDD.  I went into Disk Utility, and saw the disk, but Disk Utility couldn't repair it or erase it.
So then I shut down the computer, and restarted in Internet Recovery again.  This time, Disk Utility didn't even see my internal HDD.  I replaced the HDD with a spare I had, and same result: Disk Utility does not see an internal HDD. Now I don't know what to do.
I don't live close to an Apple Store/Genius Bar, so I'm hoping someone can give me a little advice before I commit half a day to a Genius Bar appointment.

Thanks, Brody.
Do you that that will work, even though switching the HDD didn't make any difference in my inability to mount an internal HDD?
John

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