I've never seen this board, but if something shorted while installing a disk drive, you need to look for bad pass elements (usually transistors or regulators) in the +5V or +12V circuitry.  Why they use fuses and always OVER rate them, I'll never understand.  They provide no protection for the "wiped out instantly" pass elements.  This is not something a casual observer could (or should) try to do.  Get someone with electronics troubleshooting experience (and the equipment to do it) in there to help you.  Good luck!