Hi,
I agree with dai, See if you can hook it up to an external monitor and get a sceen. See this link:
http://h10025.www1.hp.com/ewfrf/wc/d...dlc=en&lang=en
Try hitting fn F4 you may have inadvertly set it to external monitor.
If not you may have taken out the graphics card. What is the exact model Pavilion dv9000 what? Also, what version of the nvidia driver did you use? There is a possibility you may have a faulty LCD inverter.
Let us know how you make out with the external monitor.
Thanks,
Bill