I was an AV assistant in college, and we received a work ticket from a professor stating "Cannot print to printer".
So I went to the classroom and the professor was standing up taking turns looking at the computer and the printer.
I asked her to explain the problem.
"Yeah, everytime I try to print I get this message saying 'The document ********* was not printed because the computer could not see the printer.'"
"Okay," I said. "It might be--"
She cut me off. "Yeah, so I turned the monitor towards the printer and it still wouldn't print."