Everything was running fine. Left for a few minutes and when I came back nothing was moving. I noticed one of the wires coming in from the power supply was loose so I fixed it but still didn't work. I took it apart and the pcb trace right near the power supply input connector was blown. I fixed it with some conductive epoxy, hooked it back up with the power supply unplugged and it did the same thing, complete with sparks & fireworks . Anyone have any ideas on what might be causing this? Thanks.