I have a vostro 1400 working with Nvidia 8400M GS graphic card. The problem started with broken green lines on the screen and a clourful background that I can hardly read the letters. Now laptop screen is black but I can still adjust back light. When I plug an external monitor I can see desktop icons again with broken green lines. Several times I tried to reinstall nvidia driver but it did not help. I had upgraded the system to windows 7 before. But there is no support for a vostro 1400 running windows 7 on dell support page.
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