I tried installing a pci card in my p4 box yesterday and got some error relating to pci expansion rom space [I think: not enough space to copy pci option rom]. The card was one of those Hollywood Plus clones [dvd/mpeg2 decoder]. The card works in another box.

The box with the problem was:
asrock 4coredual-vsta
fx5950ultra
sblive
santa cruz
hauppuge pvr
firewire pci

Removing the hauppauge made no difference. Any ideas? Are there bios settings I should look at? Or is it just a matter of disabling devices and removing cards until the error disappears?