Stuck on A2 POST code

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Jan 11, 2014
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Using an MSI Z97 Gaming 7 motherboard and today it got stuck on the A2 post code. I used the reset button on the case to restart and it was fine.

What does A2 mean? I can't find it in the manual.
Where can I find all of this motherboard's POST codes?
I normally see 99, 9C and then A2 in that order and then it starts.

Why did it get stuck on A2? I have no motherboard speaker so I couldn't tell you

EDIT: I also don't see 9C in the manual either
 

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I restarted. None of the drives are failing. WD Utilities already checked them several times