I have faint orange lines on my imac display,what's wrong?

Just had a new video card put in,brought it home and there They were! Same issue I took it in for but these lines are a lot fainter,horizontal orange lines across the display. I just paid 200.00 to get it fixed and now this!

All Macs have a 90-day warranty after being repaired, so if you have any problem, it will be repaired free of charge. Take it back and it will be fixed free of charge. If the problem isn't the GPU, I would start thinking about a display issue

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