Each board boots. The LED on the FMDC can display an error code/status of the FMDC. But you should get something on the CRT. The CRT is bit mapped by the EZIO board. The mother board is the BSP. It also has LED to display staus/errors.
I would start by checking the logic power supply. Unless you have a very good phase conveter, it may affect the health of the machine.
You need to get a maintenance manual. There is a step by step trouble shooting section.
George
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)