The transformer is not working? That makes no sense, transformers are about the last thing to fail in a system. I would suggest a wiring issue.
I would not expect the drives to power up until the computer is stable and happy and you have released the E-Stop and pressed the ''Reset'' button. The servo power supply is switched on by the Solid State Relay on the circuit board on the left side of the cabinet (under the board behind the yellow thing, top center of the board)