First thing to determine: is it an issue of the monitor of the video card. So try this monitor on another PC and another monitor on this PC. Each of this gives a nearly 100% accurate diagnoses, together it's 100% sure.
Then, if changing settings doesn't help (and that's unlikely) it's time to replace what's broken, unless it can be repaired for less.
Kees
So my Dell SE198WFP monitor is repeating the screen a little and lines on the screen and in the right side it have a lot of white lines and please help me if you know what to do for this.

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