You need to install the correct video driver let me give you the download site along with other downloads to make sure you have everything.
http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=228&lc=en&cc=us&dlc=en&product=214330&lang=en
you need to install the first one on that list
To run the check disk utility you will need a repair disc or
a operating system disc. Put the disc in the cd drive and boot from
it. You want to get to the Dos Command Prompt (Black screen with white
letters) and type the following command: chkdsk /r
Check disk will run well over an hour or two and you will notice the
percentages going from high to low, this is normal. Let it run to
completion. Then reboot machine.
If check disk fails to solve your problem you might have to reinstall windows.
Try doing a Repair Install that way you don't loose your data, documents,
music, pictures, videos or programs.
In windows xp you get to the dos command prompt by selecting R for repair when
the options appear.
In Vista and Windows 7 you want to get to the recovery
console and look down at the bottom of the window for the Dos Command.
Get online
and got to www.google.com In the google search box type: "IBM
Support" or "Lenovo Support" (without the quotes and put your manufacturer name before Support).
Look for downloads and drivers. Enter your model number and operating
system when requested. Download and install the Video drivers.
If
you are saying that the system boots up and everything seems to be
running except the screen is blank then try the steps below.
Shine a flashlight on the dark screen to see if you barely
see the icons on the desktop. If so, then the LCD Inverter is bad.
Plug in an external monitor and see if the display shows up on it. It can be
any kind of monitor even the old big fat crt monitors as long as it has a vga
cable to connect to your computer's vga port. If so that proves your
video card is ok. The video will show on most systems when you reboot
without you having to do anything. Some systems will require you to hit the FN
(Function key) + F1 thru F12. Hold down the FN key then hit the correct
key for displaying on the monitor (F1 thru F12). The correct key will
normally have CRT/LCD on it or it will have the icon of a display.
If you see no icons by shinning a flash light and the external monitor works,
then your screen is bad. If you see no icons by shinning the flash light
and nothing shows on the external monitor, then most likely your video card is
bad.
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It sounds to me like you have not installed the correct driver for this video adapter. Go into Device Manager (right click on My Computer, select properties, select the Hardware tab, and then click on Device Manager) and then expand the Display Adapters section and see what it says.
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