Many multiple output power supplies require the primary output (high current output) be connected to a load before the secondary outputs are turned on. Understandable if the primary supply output doesn't feedback return voltage, the main circuits shuts down all outputs as a safety pre-caution until electronic repair services can be done.
The recent repair of a multi-output power supply is an example of the main output (5Vdc, 30 Amps) damaged and the other three outputs are in shut-off mode until repair can be completed on the 5Vdc circuit. Once repairs are done and a load is placed on the primary output, control circuits will allow the secondary outputs to go active.
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