If the CRT filament is lit, It is possible that either the video board that feeds the monitor or the monitor itself.
If the ready light comes on, the control appears to be running.
It is also quite possible you have lost the parameters if it was in storage for a long time.
Obviously you need to get the monitor working first to see any alarms on the screen.
In some case I have subbed the monitor with an old TTL type monitor. but they are practically extinct now.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.