I have two Pavilion 24xw monitors bought at the same time, and they appear to both be failing at the same time. The screen flickers, has lines across it (more pronounced at the edges) and fades at the edges of the screen. Drivers on my laptop have been reinstalled, and different cables, ports and laptops have all been tried with the same picture issues so it seems not to be a software issue. The image above shows the horizontal lines across the top of the screen, although the photo quality doesn't show this well.
What could be causing this? And should they be replaced?
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I see that your HP monitors are not working properly. Good job on diagnosing the issue. You have performed all the relevant checks to determine the issue clearly. Since the monitors are doing the same thing with a different cable and the laptop, I believe the issue could be the hardware.
You can contact the HP phone support for further assistance or replacement.