You have a ground fault somewhere. Check the fan cables to check and see if any aren't frayed, pinched or exposed to the bare metal on the case. Then check the fans individually in case one of them has shorted internally.
Looking at the hubs it most likely the fan plugged into the #2 socket(hub on left), with hub on right it's hard to tell since #4-6 are pretty burnt with #5 being the worst of the 3.