What Could Be Causing Black Vertical Lines on Monitor All of a Sudden?

[Jennifer Aniston]

Recently, I started seeing black vertical lines on monitor even when nothing has changed in my setup. Could this be a hardware issue, cable problem, or GPU-related?

 

[Kian]

Black vertical lines on a monitor can appear due to loose or damaged display cables, GPU issues, outdated drivers, screen panel defects, or physical damage. Testing cable, updating drivers, or using a different monitor helps identify hardware or software faults.