I thought that pins 2 + 3 were the 3.3v and not the 12v. No, I did not have the 4 pin power connected to this board. I had them connected to the other board, but nothing else was connected to the second board, just running DMX. The other board had the 12 volt option installed. Its possible I exceeded the current, not sure. Yes, my PC supply is single rail. Crossair 650 watt. I have a volt meter, but the power supply will not power up without being connected to the board. Also, since the plastic is melted, the connector will no longer stay in place. Thanks.
MP