Hi,
Please ensure that your Video /VGA/ graphics driver is installed.
I recommend you to uninstall the VGA graphics driver and use the motherboard driver cd which provided along with your laptop to reinstall the drivers back. Then the problem with your display should be fixed.
If you are not having driver cd, then download your driver from manufacturers website for your exact model.

I hope this information is helpful for you.
Please rate the solution provided.
Thanks