I’m an amusements operator. At one time we had easily 100 Megatouch games. Take a paper clip and short the green wire of the ATX power supply connector to one of the black ground wires. If the board starts to boot, it’s the board. If still no power, it’s the power supply. Regardless of whether it’s power supply or motherboard, the DBA should always cycle (assuming it has a stacker on it.)