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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, one or more power supply voltages were found to be higher than expected. ]


The motherboard should be enough of a load for the power supply.
But just in case, connect something additional to the power supply, say, a floppy drive.
If that does not change anything, the power supply must be faulty.