Sorry I forgot about this thread. If there is no light on that tube behind the monitor it's definitely not getting power. Try the obvious first such as pulling that piece out (the entire section comes off easily from the rest of the monitor) and check the pins. If they are all accounted for and in good health then start checking fuses and capacitors for issues.
I'm positive he checked all the fuses and caps and they were good. I'll have him check the monitor.