We strongly advise that you create your aids while developing your speech—
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When delivering PowerPoint or other sorts of digital presentations, make sure to practice a number of times with your slides, just as you would with speech outlines. To guard against any surprises, check that your media will work with the computers in the speech setting before it’s time to speak, and bring hard copies of your aids with you on the day of the presentation. When incorporating a computer or DVD player into a presentation, keep in mind basic principles of using aids: practice with the aids (ideally, in the room where you will be presenting and on the same equipment), consider taping power cables to the floor (to avoid tripping over them during your speech), and make sure you have the video cued to the right scene before beginning your speech.
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To see an example of a speaker making a mistake with a presentation aid, try Video Activity 14.1, “Presentation Software: Checking Beforehand (Needs Improvement).”