A bit to late response to this, but better late than never they say. smile

I think, check the vdc outputs from the psu, see if there is a failure with one of the outputs.

In any case, without having the 3v on the pin 4, the psu will not turn on.
More about this, see this topic.
https://jb8a8f8.com/support/index.php?threads/testing-the-dm8000hd-psu-without-the-motherboard.84/
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Johnny B.

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