Thanks everybody for the help. I tried the image, but it didn't change anything, and I inspected the screen again, and haven't seen a thing. I left it turned on for 20 mins, but the LED just kept shining steadily, not blinking. I guess, it is something hardware, though not screen. Since it is refurbished item, I can imagine, it wasn't not top-notch from the beginning.
Again, thanks everybody. I will now start my research for the new model.
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