Just now, while you are performing on stage, the beamer breaks down! How can you save the presentation so that your audience will remember you well? I will get to that in a moment.
Are you familiar with your equipment? Have you considered all eventualities? Are you well prepared and equipped for your performance? Then you can deal more confidently with situations such as a broken beamer, power outage or other unexpected disturbances. You can avoid a large part of these problems through targeted preparation.