Re: Broken power supply?
You have to have the AUX connector power or the board doesn't fire up. If you have the board out and want to power it up, you have to have both AUX and the main power connected.
I sure hope it just did a self preservation shut down. If that metal piece was on the high voltage end of the inverter you may well have cooked the board.
Not meaning to pour salt in a wound, but you never ever work on a system with the power on it. Shut down, unplug, give the caps time to drain, then do what you have to do. Never on a live system.