I looked at the display adapter in device manager, (Compaq qvision) which has an yellow symbol next to it. When you click on properties it says there is a code 12 error "the device cannot find enough free resources that it can use (code 12)" You will need to disable one of the other devices on the system.
I think there is about 512 of RAM in the machine, and I know that the pc has run windows 2000 before with no problems (I've recently reformatted it).
Thanks for the replies. I tried unplugging a usb device to free up some resources, and then reinstalling the display adapter and that didn't work. I downloaded belarc, and that says no display is detected. Any ideas? Should I try reinstalling windows?