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I gave the operator the benefit of the doubt that he'd had a "d'oh!" moment, and we continued talking about it for a few minutes. Then I realized that he truly didn't understand what had happened, so I backed up and explained to him that when he logged in remotely, what he was viewing was his monitor, not the remote monitor.
He believed that what he was seeing in front of him was what the remote operator was seeing a half mile away. With a remote connection, what he was seeing displayed was the remote PC video output -- and, of course, that looked fine on his monitor. However, the remote monitor was failing and, thus, didn't display the video output correctly.
It took a few explanations, but he finally got what I was saying, and I'd had another "colorful" experience in the world of IT.
I was reminded that just because someone works in IT does not mean they know IT. Even with years of experience, the operator could not differentiate between what he was seeing remotely and what the remote operator was telling him was wrong. We all have gaps in IT knowledge and skills and can learn from each other.