Exploded... like... litteraly exploded? or are you speaking metaphorically ^^"?
if it has really exploded like "Dokan!" well... just wow...
I hope the HDD survived.
While this topic might be just a joke, in reality a Power Supply Unit for PC can actually burst in flame when failed (especially the cheap ones which has no safety features). The capacitor in it can literally explode and make a loud bang - similar to firecracker sound.