P2414H vertical dead line

I have 2 p2414h and BOTH have the same problem which is a single dead vertical line on the display.

Problem exists regardless of input, it appears more obvious when under white background.

Both had been factory reset; issue remained.

Please give me some help here; i do not have the receipt and because small monitors do not have service tag ;the only thing i have is the S/N code from the back of the monitor.