since you built this rig yourself, you do have to becareful, if yo do not properly ground the board in the casing, it can shortcircuit the bios or anything else in the board itself. Not only that but why in the world would you hire a technician to flash bios with data YOU provide? if you know how to obtain the bios flashing data, surely you could have went about flashing the boards yourself.

my suggestion to you now is to obtain a tester and see if there are any leaks on the circuits, if so you are SOL, will need to get new board.

remember always wear anti magnetic gloves when handling computer hardware.