colours

Are you sure you have the correct drivers for your video card? If so, tell us everything you can about your computer, from the hardware to the OS to the drivers you are using.

Nikki

This usually happens when a driver file is lost or damaged.

Start by re-installing the drivers for the mother board / chipset on the PC.
If this is a name brand system, use the manufactures system drivers.

Then, Install DirectX if required for your video card. (available from Microsoft)

Then, install the latest drivers for your video card.

Finsh by verifying that windows has detected your monitor properly, or by installing the driver from the monitor mfg.

For motherboard driverswww.motherboards.org
For video and monitor drivers www.driverguide.com

To verify the driver installed;
Control Panel;
Display Properties;
Settings;
Advanced;
Check both the display adapter and monitor tabs.

Chas