I tested the flash with some freshly charged Eneloops and then some Duracell batteries. Each battery was tested for a full charge as well.
I tested the unit in Ettl mode and then rolled dial over into every manual setting, as the lights show. This was done on and off two camera's none-the-less. As noted, it lights up but it will not fire no matter how it is tested (on camera, off camera, test button, shorted).
The Seller is a stand up person though. He apologized for the issue and has just issued a full refund. He left it to me to attempt a repair, part it out, or trash it....
Does anyone know where a capacitor can be had for these yn-465 units and the proper manner in which to discharge these units?