I just changed the default cpu-heatsink and fan on a refurb mobo that I bought last year for a larger version with more heat dissipation capability, -and the power supply now immediately shuts itself off after the initial powerup. *sigh* Looks like some kind of short, probably the mobo but I will not know for sure until I install a replacement cpu and swap the fan.
Do not count on refurb mobos being able to handle the physical stress of changing the heatsink clips and fan swap as a given.
I’m paranoid about incompatible stuff