faint black lines

  amosoreilly 14:46 14 Dec 10
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i have medion 96630 laptop, about 5 months ago i sent it back to medion as i was getting colored lines across the screen, they replaced the nvidia card and all has been great, but today i have started to get faint random black lines appearing on the screen again. the lines only appear the my laptop is actually being used ie, using the keyboard or mouse, or on open google page. i have tested for viruses, done the usual graphics card updates none needed. problem is my warranty runs out in feb 2011, so should i send it back to be fixed presuming its the same problem or could it be and error in my system, with thanks.

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