When you google M900 Tiny you get this:Yeah, but the dell thing isn't a hardware induced reaction to poor quality power, it's an arbitrarily imposed restriction based on the lack of the third sensor pin. Is this a "thin" client mini-PC that's powered off of a power brick, and are you using a non-OEM brick?
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You seem to be working in the right direction. Strange if it was fine and then started to go though. So many different possible combinations of hardware, so many possible points of failure. About the only good thing about Apple is their iron grip on their hardware. Still overpriced hardware, but they control it.