Vertical line on my display

  SnowMan2 21:45 30 May 2018

Hi im having this display problem...So there is this one horizontal line on top of the screen its mixed purple,red,blue and green Im using a plazma tv so i tought maybe its my tv so i connected it to another tv and there was no line it only shows on my tv so i checked the tv without the pc just started watching it normaly wihout using the pc on it and everything looked fine there was no line it only shows when im using a pc on really confused i dont know what is the problem

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