Spontaneous hard shutdown -- cause?

[William Park]

Hi All,

For few days now, I'm having spontaneous shutdown.  Not a reboot,
but just sudden power down with no log to tell what happened.
No problem with hydro.  Just before the shutdown, I hear some
relay being triggered in the power supply.  It's the same sound
you'd normally hear in the normal shutdown.

So, I'm thinking bad motherboard.  Has anyone encountered this
kind of symptom before?

--
William

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