When stories and Powerpoint clash

A mantra I keep hearing is "we need to tell stories to influence change." I agree with this, however, I do have a few provisio's

• if the story has no relevance to your message then why are you telling it?
• if you provide a personal story to illustrate your values then please make sure it connects with the audience at the time (please update and avoid repeating)
• when you use PowerPoint to tell your story there seems to be a dissonance - the method is not matching the intent

As a method of influence, especially for large scale change, stories work well because they contain the emotive meme that a PowerPoint presentation usually lacks.  So let's use stories, but let's use them advisedly and with care.