Before rebuilding my brother’s computer I did some troubleshooting to see if I could get it to work again and tracked it down to a mobo power supply issue.  The 4-pin 5V connector wasn’t working correctly and after some searching under magnification I saw a tell-tale bump which indicates something on the PCB blew.  I thought for a second how many people would be able to figure out that minute a problem and smiled smugly.  While cleaning up after the disassembly I turned the motherboard over and saw the 3-inch diameter scorch mark centered on the back of the pin-prick I’d seen earlier.  I smiled anti-smugly realizing how much time I’d wasted finding a defect with the cross section of a pubic hair when I should have seen the scarring on the back that looked like it’d been inflicted with a brule torch.