I say your mobo's broken a suggestion when cleaning out a computer is (if possible) to take it outside and use compressed air. It is highly unlikely that the static charge from the vacuum would have fried your power supply (they aren't that sensitive) it's more likely to have screwed with something else as their are many much more sensitive parts on a computer
One of the problems the internet has introduced is that in this electronic village, all the village idiots have internet access.