Nvidia has recently admitted that there is a problem with their Nvidia GeForce 8M Series. Symptoms include either not being able to display anything, or having colored lines across the screen.

http://www.consumeraffairs.com/news0...08/nvidia.html

ya lol, i changed the graphic card for twice which a brand called nvidia 8400, and it seems to have coloured lines across the desktop occasionally or everytime i log on my user