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there could be a problem with your graphics card (this is called vertical lines on LCD), if this is a desktop, try removing the graphics card and use the integrated graphics card(built-in) and see if you can still see those vertical lines. hope this helps
Please try to connect the monitor to another PC, if problem still exist then probably there's an internal problem in the circuit board of your monitor wherein an elecronic part/s might be cold soldered / defective. I recommend to bring the monitor to an authorized HP service center to fix the problem. If the monitor display is good if connected to other PC, then your previous PC should be checked if the VGA card (if there is any) is properly placed to its slot & working properly as well as it cables & connections. regards