Man, so sad to hear that has happened to you. I didn't even know it is possible to have fire while mining coins
easy adjusting voltage = shorting boards out, buring wires, happened to me'
board/wires were running fine for a week, but board smelled like it was burning, had power board li on +20 like many people say to set it to (do not do this), a week later brand new 850 watt power supply burned out, I got new one, and wires melted/started sparking against case.