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1Measure the voltage at pin 16 ("PS_ON#") of the mainboard connector. It should be held at 5V by the PSU when the server is off, and is pulled to ground by the motherboard to switch on. It sounds like an internal 5V rail is unstable, causing the PS_ON# pin to trick the PSU into switching on and off repeatedly. Check the stability of pin 9 ("+5VSB"), too. If that is stable (and pin 16 isn't) then connect a ~10k resistor between the two and see if that stops the problem.– CharlieHansonCommented Jan 4, 2016 at 11:44
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