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My xbox had a short in it one time, on the power supply. I looked the power supply up and down for a long time, but couldn't find any errors. I took the mobo out, and found a blown 12V trace. I fixed that, but then a couple of weeks later, the mobo blew again, and when my friend borrowed my PSU, it blew a trace on his mobo. So the apparent cause of the broken xbox was the mobo, but the root cause was a faulty PSU.
If you completely and utterly rocked the 5V output on the PSU, it has the potential of blowing your mobo, kicking your DVD drive, smoke a controller, and still appearing to be fine.
As for the cause of why this happened? With me it was a tiny shard of metal left over from a case mod, but with you, it might not even be a short (though I have seen a pic of a guy that had a PSU that was shorted by a tiny lizard. Don't ask, don't tell.).
Keep it real, and good luck.
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