Red Line in Display

Hello,
I have noted that in certain times appears this line and I have no idea what this can be. The image in attached. (zoomed).
NOTE: The line disappears when I click something like changing tabs.
 

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We need just a bit more information. Which version of FreeBSD? On exactly which hardware, particularly the graphics card? I see a red background, not lines exactly. Does it always do this when you do a specific thing, or is it somewhat random? If you can trigger it every time, how do you do that?
 
Right..

Version: 10.3-Stable (also occurred in release version)
Graphics Card: Intel HD Graphics 2000

It happens randomly, not imagine the cause or why..
 
It's either the cable that's faulty, I've seen similar things when the VGA connector is only half in. Or there's something wrong with the display itself.
 
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