Question Black lines appeared across lower portion of monitor. Now gone.

[Balic Blackthorn]

So, this morning when I turned on my monitor, I noticed black lines had appeared across the bottom of my monitor. They persisted after a computer restart, BUT went away when I changed my display settings for my monitors from Duplicate to Extend.

My computer is hooked to two monitors and a TV. The lines only appeared across the bottom of my primary display, which is
https://www.newegg.com/p/N82E16824012053?Item=N82E16824012053

My secondary monitor is a Dell SE2717H/HX.

The display's native resolutions are the same, though the primary monitor does have a much higher refresh rate than monitor 2. This is the first time this has happened since I purchased the monitor a little over a year ago.

I DO have a protection plan for the thing. Is it time to file a claim? Replace a cable? Just keep an eye on it?

(I did also have a new video card put in about a week ago.).

 

[Fix_that_Glitch]

When the black lines are present take a screenshot. If the black lines are in the screenshot then you have a problem with your gpu or cable. If they do not appear then it is a problem with your monitor.

 

[Balic Blackthorn]

When the black lines are present take a screenshot. If the black lines are in the screenshot then you have a problem with your gpu or cable. If they do not appear then it is a problem with your monitor.

That makes sense. Thanks.