Someone asked me to look at this power supply. It's a 12V 40A supply. They only told me that it didn't work. I changed out the fuse in it, which is 10A. After I did that I plugged in just the input board and the FET in the picture marked with the blue dot shot flames out the side instantly. I changed out that FET, and replaced with another of the same, IRFP460. The replacement did the exact same thing. I don't see anything burned or broken on the entire board. I do think that someone dripped oil onto the output board, but the input board doesn't work even without the output board attached.