Thank you Cal and Macario for your suggestions. I've actually done all that. Took out the battery overnight. And yes, I am shooting in AF-S in single shot mode.
I messed around with my ist DL and the 360FGZ Flash. Works perfectly, even in complete darkness, the red beam shoots and it focuses pretty fast. On the other hand, when I attach it to the K10d, the IR red beam never lights up, no matter what I do. I can't tell if it's a setting issue where the electronics are not sending the signal to the flash pin, or it's a physical problem with the board. I'll keep messing with it, can't get any worse.