(Hardware) Machine will not boot - strange situation

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http://serverfault.com – We have a LGA1366 build (about two years old) that would suddenly not turn on about six weeks ago. Power was getting to the motherboard (on-board LED was on) but pressing the power button (whether through the case button or on-board power button) did not turn it on. I started a process of diagnosis, and eventually found that if I unplugged the 3.5" internal card reader from one of the USB headers, the motherboard turned on fine. So, the problem must have been a short within the card reader. Life goes on. But two weeks ago, with the card reader still unplugged, the same thing happened again. (HowTos)