You are going to want to fix the problem ASAP. It is going to require you discharging the monitor. Make sure you read up on it before doing it as we are talking about 15,000-20,000 volts. Once discharged, you will need to remove the anode from the anode hole (the suction cup thing) and clean any moisture you encounter. There is also a spray you can use to prevent future moisture, etc.
Again... MAKE SURE YOU READ HOW TO PROPERLY DISCHARGE YOUR MONITOR ELSE YOU RUN THE RISK OF HURTING YOURSELF...AND EVEN DEATH (no BS).
Do not operate the game with the monitor sparking like that.