The guru

Yup, I'm the guru around the house, the computer guru, but there're still times I can't spot the problem right away.

"Damn it to hell!" A curse came from my landlord's room, which signaled something troublesome he was having, so I went to his room. 

"What happened?" I said. 

"The printer won't print," he was fuming.

"Let me take a look." 

I used this printer before and knew the printer driver was installed on his laptop, so my first thought was it shouldn't be software related. His room wasn't properly lit and he didn't have a desk lamp at the time, so I couldn't see very well when I peeked at the back of his printer. Even so, I could still see the USB cable was "attached," so I moved on to his laptop and checked some settings. Everything checked out fine.

Just when I was puzzling it out, he mentioned he didn't hear the usual chime when he plugged in the USB cable to his laptop. A thought came to me. I turned his printer around and saw this: