It must be my aura or something?
Sometimes, I just have to walk into the room and ask people to "try again" and the computer starts working properly. Sometimes, I can do it by phone. Sometimes it works when I remote to a PC. What I think gave it away was when someone said they just asked themselves "What would Spanners do?" and it all went right.
As a group, IT support is often seen as pretty laid back. Perhaps many of us are. The rest of us are probably just calm. That is the magic. Even when we are not clear on what is happening, most of us tend not to get too stressed about it. "Stress is for managers and developers." Just an air of confindence and people try again and, this time, omit the tiny error that messes it all up.