The nothing

Me: What do you see on your screen.
Him: Nothing.
Me: Are you sure about that?
Him: Yes im sure.
Me: Just to confirm, you have no error message, you see nothing.
Him: Thats right,
Me: Tell me what you see on your screen?
Him: Nothing.
Me: Are you sure about that?
Him: Yes im sure, what can you do about that.
Me: Nothing....