I suppose it's possible then that the exposed purple wire touched a heatsink and shorted out the cap. I would replace the cap, tape up the purple wire, and hope for the best. This time it might be best to take some readings with a multimeter before you plug anything into the ps.

Your ps looks different than the ones I've been working with. On the last few that I've converted, I've actually taken the board out and unsoldered all of the extra wires and removed them from the case. Really cleans things up on the inside.