Line at the top of the screen following open window (or cursor)

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May 16, 2018
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Hi There,
I have bought a new Dell Inspiron 15 (N-7560-N2-711S, Intel Core i7 7500U Kaby Lake, 15.6" LED 1920x1080, RAM 8GB DDR4, NVIDIA GeForce 940MX 4GB). There is a strange moving line at the top of the screen. If I am moving an opened window (which is not full screen) that line is moving above that window and its colour depends on the main colour in the window. It increases/decreaces also its brightness when the window is moved closer/farther to/from the top. The lenght of the line is proportional to the window's width. I have never seen anything similar.. Might it be graphic card drivers or some windows 10 issue?
Many thanks for any ideas in advance. I do not have any external monitor to try, only the laptop screen.
Cheers,
Richard
 
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