intel DQ965GF and nVidia PCI woes

[michael]

Folks, I'm new to Fedora so please excuse anything I'm ignorant about!
Having said that, I've been Googling about and trying different things
for a couple of days so I think it's now time to ask the experts (you!).

I've got a new box, it's got a intel DQ965GF mobo, with 2 SATA disks
(LVM) and came with Fedora 2.6.22.1-41.fc7 running on it. I wanted to
put my old nVidia geForce fx 5200 (PCI card) into it to allow me to use
both my TFTs. However, when I do this it gets to the GRUB menu, starts
to load a kernel (is that the right phrase) and then falls over. If I
leave the card in but tell the BIOS to use the internal graphics it
boots okay. But when return BIOS to auto detect or explicitly use the
nVidia card it falls over during boot. I've tried appending 
 acpi=off
 pci=nommconf
at the end of the GRUB boot command but with no success. Generally the
failure messages say (at about the time there's agpgart messages):
  general protection fault 0000[1] SMP

I'm at a loss as to why it's not working!

Many thanks in advance, 
Michael