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Laptop screen flickers (vertical lines) - what's the cause?

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There should not be anyway of them knowing you were to buy a new card and tried it out... If you need your answer now you can always reassemble your computer and send it in...

Your a student (and so am I). I know this will suck to hear, but you might have to live off school computers for a bit
I would definitly try replacing the card. You can always take it back..