Astrofest just a few weeks away, I thought I'd do a fresh dark and bias library. So camera (QSI583ws) was not on mount in normal configuration. Plugged in power supply and bzzzt -puff of smoke. I had accidentally used the mount's 24V supply instead of the camera's 12V.
It's dead. I've emailed QSI to see if I express courier it to them for repair (if possible, that is), if I can get it back in time for Astrofest.
Other option is to just get the board, which I assume is all that's fried, sent over here and I find some kind and skillful soul to assist replacing here.
I can't believe I did it.