not sure what you're testing, if it's jamma boards then make sure you have a jamma harness.
r,g,b,sync, and ground should be going to the monitor.. check the monitors manual for the correct pin locations.
the jamma harness will have those pins on it.
make sure you have power to the monitor going though the isolation transformer.
the power supply does'nt need to be run on the isolation transformer, you can if you want but not needed.
EDIT: oh i see you need help identifying the monitor, that i can't help you with.