You need to find the rail at which the power supply monitors for its feedback. Maybe 12V? it depends. Once you find this, you put a load on it. AKA, resistor. Maybe a 680ohm or a 820ohm depending on the rail.

Also, check your output rectifiers and check the opto-isolator and any TL431s in the feedback stage. this will cause the crowbar-restart syndrome.

If you have no load on the feedback rail, it will cause an OVP trip, other words, it will grossly overshoot and the SMPS controller will latched into a timed-shutdown. Usually it restarts, but it depends on the controller. If it restarts and the fault condition still exists, itll shut back down. This is what the tick-tick-tick is.