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Is My Graphics Card About To Pack Up?

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I am looking for some help on a display problem with my Sony Vaio laptop. The display shows parallel broken lines made up of coloured dots running across the screen. At other times broken blocks of colour are also seen at various places on the screen. The severity varies from time to time . It is not a problem with the screen itself as I have hooked up to an external monitor and the problem still occurs. I have also tried uninstalling and reinstalling the latest driver but this has made no difference. I am concerned that this is an indication that my graphics card (Nvidia GeForce Go 7400) is going to pack up as, being a laptop, there is no way to replace the card. Any help would be greatly appreciated.
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Yep sure sounds like the video ( or possible the video ram ) is the issue... If the computer uses shared ram you could try changing the laptop ram, or if you have two sticks try removing one or even switching the two around....
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