Problem in my Pc's screen


Right off the assembly line

hello frnds
i was using Compaq presario ALL in one pc CQ1-1030IN

it was having 18.5 inch screen it is showing 3 lines on it 1) blue 2) yellow 3) pink once it was onlt one line some times it goes and then come back now they are not moving. this happen in past also but at that time pc in in warranty they remove the screen and change with new one.
please help me to resolve this problem.
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