Quoth Hyndis
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One, the miniature power connector that goes to 3½" floppy drives is close enough to one variety of audio-in connector on some older sound cards to be able to plug in there. Obviously that's not where it belongs. I've never done this myself, not being a total imbecile, but heard of it happening once. (And I still have a CD-to-sound-card audio cable with three different plugs paralleled at the sound card end, one of which is identical to the floppy power connector.)
Two, the said connector can be plugged in where it does belong, on the back of the floppy drive, but shifted one pin to the left. This has the effect of connecting either the +5 or the +12 directly to ground. (The two outer pins are grounds, so if you shift it, at least one of the hot pins is grounded.) This did happen to me, causing the almost-new Antec power supply to say "Phut!" and yield up the magic smoke, roughly ⅛ of a second after I hit the power button.
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