fix Nvidia problem.

most common problem with all laptops which are having BGA NVIDIA graphics chip,given below.. 1) bad display/black2) running vertical/horizontal lines of whole lcd display3) restarting/hanging5) no display(blank)6) external monitor projector display okay but laptop lcd not showing display7) laptop lcd showing display but no external output.Let see how to fix nvidia problem in HP DV2000 laptop..