Long story short, I plugged a 12V connection into a circuit that OUTPUTS 12V or 5V (I'm not sure), something exploded, but the motherboard still functions 100% properly. I'm curious what I blew and if it will cause me issues in the future.

Pictured is a burn mark on the back of my computer case near the center of the frame, along with the fan header (labeled PWR_FAN1) that I plugged the 12V connection into.

Thanks in advnace :>

Sorry, forgot the picture! http://i.imgur.com/S2EBFbw.jpg