Power Supply Ticking, Light Flashing
It was "hiccuping" in order to prevent damage from the short circuit condition. Once the short circuit condition is removed, the PSU restores normal operation.

From the reference:
"The operation of hiccup is as follows. When the current-sense circuit sees an over-current event, the controller shuts off the power supply for a given time and then tries to start up the power supply again. If the over-load condition has been removed, the power supply will start up and operate normally; otherwise, the controller will see another over-current event and shut off the power supply again, repeating the previous cycle."