... with a technically challenged colleague:
Her: My mouse isn't working. It's a cordless one.
Me: Is it rechargable or does it take batteries?
Her: Oh. I don't know.
Me: Does the red light work underneath?
Her: It doesn't have a red light but it has a green button.
Me: ?! Let's see... [removes battery cover]
Me: See those batteries? Try changing them for new ones.
Me: I see your mouse is now working.