I have a 4MB AGP graphics card made by S3.

When I try to change the colour from 256 to 16bit I get a message that says:

The display control panel is unable to change the display settings. Please check your display hardware in device manager.

This also happens when I change the screen area.

I have the latest display driver installed. The latest VIA drivers installed and DirectX V7.

I changed the card for an 8MB SIS based card and installed the driver that came with it but I get the same message.

About 5 minutes after the PC has booted I get a second message that says Error: Invalid Display Format.

I have checked in Safe Mode and removed all references to Display Adaptors and Monitors but this still has no effect.

Anybody got any ideas.

Thanks in advance.

Stuart