Probably it is just the monitor which doesnt work. Maybe the resistor that you adjusted broke or something. cose if you can jog i should mean you are good.
Put your hand to monitor"s face if there is a static charge the HIGH voltage is OK.
Check the neck of the monitor's tube (powered on) at the neck (the end where the pins are) is should glow a bit (amber /orange). This means the heating is OK.
If it does, maybe the video signal is not present - check black koax cable.
If nothig is missing but no pic you should try a monitor with coax input. Still no pic then video panel is broken.