Since Windows did not boot I don't suspect Windows.
This sounds like a failed HDD. And we can test for that. Go get any of the LIVE LINUX BOOTABLE CDs (I use Ubuntu) and boot that CD (yes you may have to set the BIOS to boot from CD) and see if the explorer in that live linux shows the HDD.
I have an HP Pavillion DV2000 Notebook with a NVIDIA GeForce Go 6150 Graphics Card.
The most recent driver version is on the HP website is: 2008-01-16 , Version:22.214.171.12443 A, 133.68M.
I cannot locate a more recent version.
When I put the computer to sleep or if the computer is turn off, the display does not come on.
If the computer is sleeping and you touch the pad or press the keyboard, the computer comes on but the display remain blank.
I am suspecting the problem is the graphics driver.
I installed Windows 7 but could not find the windows 7 driver for NVIDIA GeForce Go 6150 Graphics Card.
I also get this message on the screen when the screen does turn on after shut down or restart:
NVIDIA Boot Agent
Copyright 2001 - 2005
Copyright 1997 - 2000, Intel Corporation
PXE - E61: MEDIA TEST FAILURE, CHECK CABLE
PXE - MOF: EXITING NVIDIA Boot Agent.
This message keeps displaying but nothing else happens.