also, you can open the computer up and see if the headers are connected properly by refering to the motherboard manual...but if the stick worked while connected i'm going to tell you the headers are connected correctly

i'm guessing this is a problem to be hung on your PSU, which probably overvolted the 5v or 3.3v rail (I forget which one off the top of my head that USB is driven on) and it basically over-powered the drive, causing failure

I would suggest looking at a new PSU