Anyone know what these white lines at the top of my monitor are?



They do show up outside of the game and they show up when Im using my consoles on the hdmi mode.
 


It's an ASUS VH238H
The consoles use HDMI and I tried 3 different HDMI cables
I have two monitors one vga and one dvi and they both show the lines
 
IF you happen to be running a 60Hz refresh rate (which would be rare with modern systems) it could be a "hum bar", caused by 60Hz "hum" from somewhere. If you think this is vaguely possible the first thing to do is to make sure all the ground connections are good (including unplugging/replugging all power cords at both ends and unplugging/replugging the monitor cable at both ends). But it's more likely to be something like a failed capacitor in the monitor or display card.

Sounds like a hardware issue with the monitor (or more specific, the built in LCD panel; in short: time to buy a new one).

Due to the fact that the issue is isolated to a single line (even with multiple pixels in height) it's unlikely it's the actual signal (e.g. cable or connector pins).

Some issue with the connection would most likely screw up several lines and/or the whole image and it won't be isolated to exactly one line (especially with digital connections).

In a similar way, issues with the graphics card should most likely cause issues with the whole screen (like garbage/random patterns). Those shouldn't be isolated to a single line.

This could be some extreme case of stuck/dead pixels (i.e. the whole row is somehow damaged).

What you could try (this won't necessarily help because we simply don't know what caused the actual issue in the first place):

Turn off the monitor, disconnect all cables, and put it flat on your table (screen up) so it's sitting plane on the table. Let it sit there for a night, then try again.

If everything else fails, what happens if you use your finger nail and pull it over the faulty line? Don't push too hard, just so there's some pressure (typically shows some short colored trail that should disappear within 1-2 seconds). Can you see any additional patterns or "waves" that don't fit to what you see in other areas of the screen?

https://superuser.com/questions/710321/what-is-the-cause-of-a-horizontal-white-line-on-an-lcd-monitor
 
MERGED QUESTION
Question from tshafe : "Both of my Asus monitors just randomly got these white lines at the top of them"







I hope this forum will help you.
https://www.reddit.com/r/Monitors/comments/3zo5qy/asus_vg248qe_white_lines_in_middle_of_monitor/