Some days before I have got the Lenovo Thinkpad W520 as he was having the problem in his laptop so he gave me to solve that. This laptop has NVIDIA Quadro 2000M graphic chipset. The laptop is very nice. The main problem is with the laptop is sometimes it display my wallpaper bright and some time it gives lines on the desktop. I donít know what is wrong with my laptop but I want to solve this problem as soon as possible. If anyone have solution for this problem then please give me that.