ViewSonic monitor has vertical lines

Vertical lines appear on monitor - is it the video card or the monitor? Also, at other times an image from previous imagery remains even when I change sites. Is it the monitor, video card or both?
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  1. you gotta do some testing to figure out which it is...first I would check to make sure your cable connections between monitor and video card are still solid...after that what you should do if that doesnt solve it is to bring another monitor/tv in and plug it into that pc....if the problem disappears then you know its the monitor/cable if its still there you know its the video card.
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