Question What is the cause of this transparent line on my laptop display?

[Hypnotic47]

I have a Asus Zenbook ProDuo and a transparent line appeared on the screen.

I usually keep it connected to another display. The second display does not present the line. I am not 100% sure, but I think the line appeared when I disconnected the HDMI cable.

Here is a video:

View: https://www.youtube.com/watch?v=veSJpqhqrA8

 

[Lutfij]

The issue is with the panel, since it's fixed in one area of the panel, if it were a GPU issue, the issue would move around with the window. You should think about replacing the panel on the laptop.