PC 600W Power Supply Shuts Down After A Second

by Miguel
(Tolima, Colombia )

Im repairing a power supply and when i short the pins to turn it on for measuring, the fan spins and then shuts down completely. I can't even measure it with a power supply test device, it turns off before I can get a reading. What components should i test, or what could be the failure? (Also no exploded caps or anything visible).

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