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Strange PC Power Issue

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Not sure where to post this, as not sure what’s causing the problem....

Asus Z170 Deluxe motherboard and Corsair TX750 Power Supply.

Issue...   When I power down the PC, all LEDs remain powered, and cooling fan in Corsair power supply continues to spin very slowly!

I’m aware that a powered USB hub can (and does also cause this on my PC), but even without this plugged in, it still continues until I shut off the PSU.

I’m guessing this could be a PSU fault, but it started after replacing the motherboard. BIOS updates make no difference.

Any ideas guys?

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System may not be truly shutting off when given the kill signal from the O.S.  I've got a machine that does that.  Just power off manually after the screen blanks off when you do the normal shutdown routine.  

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