Pavillion dv9000 screen is gray, with external

Hi,
Your display drivers could be corrupt.
Boot the machine into safe mode. Right click on Computer and select manage from the sub menu.
When the window pops up select Device Manager.
A device list will populate. When it has look down the list for Display Adapters. Click on the + icon next to Display Adapters to it expands. Right click on the display adapter and select uninstall.

Restart the computer and let it boot in normal mode.
If it boots in normal mode let it detect the Display and install the drivers for it.
I would be a good idea to update the display drivers via the HP support website.


Regards.

backup all you important data to usb flash drive,using F10 or F11 restore it to new factory new conditions. You most likely have atrashed vista with spyware and virus like activity and very corrupted windows.