Screens go dark, projectors come with ports that aren't compatible with your laptop, and computers install updates that require them to restart without notice. Technical issues are inevitable for trainers and speakers, so you must be prepared for them. Here are four methods to ensure you are.

1. Have digital backup. Store your presentation on a flash drive and email the presentation to yourself. These tools enable you to load your presentation on a new device and keep rolling.

2. Have physical backup. Bring a handout of your PowerPoint presentation that you can use as a guide in case you need to continue without technology.

3. Keep everything handy. Put both your digital backup (flash drive) and physical backup (handout) in front of you so you can access them without missing a beat if something goes wrong.

4. Practice staying calm. Prepare until you have the confidence to deliver your presentation regardless of what happens. Your audience wants you to keep moving and usually will forgive technical errors if you do.