I was trying to hook up a fan to a fan header on my board with an extension that adds like 15 inches to the power wire from the fan and like a dumb ass I hook it up to the header first while the pc was on and was fishing it down between my video card and the board and when it got to the bottom it touched the bottom of my case being aluminum it shorted or grounded out. the psu shut down then powered back on and shut down again before I could cut the switch off in the back. I ended up burning out 2 of the headers marked for chassis. Luckily I didn't burn out anything else. Thats the last time ill try that again. I was'nt even thinking about the other end being live with the 2 prongs sticking out. The last time I did something dumb was when I was poking around the psu conectors with a multimeter and ended up toasting a board. I got lucky this time. Another lesson learned thats for sure.