Why just as recently as Monday I was giving a presentation to a bunch of the new hires. About 5 slides into my presentation, someone noticed that the slides I was reading from the laptop and referring them to were not displaying on the projector.

Oh well, the key in that sort of situation is just to roll with it, so I did. I just went right into the presentation fully verbally, giving them orally the information they were missing visually. Being really conversant with your materials is definately an advantage! (always make your own presentations, never gives the info to someone else to make a presentation for you)