[SOLVED] Some sort of component or cord is visible on my display's matrix

Solution
What is the refresh rate set to? If higher than 60, set it to 60 and see what it looks like. I have seen this pattern come up on higher refresh rate screens, I had two 75hz screens that showed similar lines, although not quite as pronouced.
That looks like there's a defect to the panel, if that's the same regardless of what image you have up on your display. More like the same mark seen when a panel is squashed to the back of the bezel.

You might want to consider letting your seller and/or HP know of the issue in case you qualify for an RMA.
 
What is the refresh rate set to? If higher than 60, set it to 60 and see what it looks like. I have seen this pattern come up on higher refresh rate screens, I had two 75hz screens that showed similar lines, although not quite as pronouced.
 
Solution