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[ 1. Power supply's fan is turning.
  2. The only load on the power supply is the motherboard.
  3. Under the load of the motherboard, all power supply voltages/signals as expected. ]


So we know that the power supply is working; it is producing the required outputs under load.

That means that the motherboard is faulty.  And because the voltages/signals from the power supply are as expected, we know that the nature of the motherboard fault is not a short-circuited component (capacitor, or other), because that would overload the power supply.

What Now?

We have eliminated the possibility of short-circuit components (capacitors, and other) on the motherboard.

Your motherboard could be faulty due to any of the many motherboard components.  Click here.