o.k i see your problem now,its best to prove the monitor is fine first-do you have access to a multimeter as i suspect you have a bad psu-also always good to post a pic of the chassis as we can tell what it is,another way to prove the monitor is operating is to turn up the screen volts on the flyback transformer to see if you get a white screen,although this does not prove 100 percent that the monitor is functioning perfectly at least it points toward psu or game board or signal problem