No power to peripherals

Hopefully some you of will be able to help.

The other day I woke up to a BSOD. In a half-awake semi-vegitative state still, I stubbornley just shut it off manually. When I started it back up later that day it, well, didn't start up. The power light lit up, but its acting as if my monitor, mouse and keyboard aren't plugged it.

I checked all the connections and everything is secure. I also replaced the battery on the mo-bo. I had it tested and it was dead but when I replaced it nothing happened.

Any help/clues as to what happened would be much appreciated
 
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