pam123, thanks very much. That's one more problem out of the way!
"So, go into the BIOS, make sure that the chipset SATA is enabled, disable RAID for chipset controller, disable any third party controller that you wont use."
Looking at the manual, this is what I think I'd do - please criticise / let me know if I've got it right.
- Boot from the CD drive first, SATA drive 2nd.
- SATA drive plugs into the first SATA port of the nForce4 chipset
- An HDD and a DVD-ROM sitting on the first IDE channel, both jumpered to cable select. (Or could I make these into IDE primary master and slave manually? Would that conflict with the SATA boot?)
- A CD-RW sitting on the 2nd IDE channel, jumpered to cable select.
The BIOS fields as quoted in the manual (plus my uneducated choices of how to set them! this is where I get a bit wary, never having done it before!):
- IDE/SATA RAID Function [Disabled]
- IDE Primary Master RAID [Disabled]
- IDE Primary Slave RAID [Disabled]
- IDE Secndry Master RAID [Disabled]
- IDE Secndry Slave RAID [Disabled]
- Serial-ATA1 [Enabled]
- SATA1 Primary RAID [Disabled]
- SATA1 Secndry RAID [Disabled]
- Serial-ATA2 [Disabled]
- SATA2 Primary RAID [Disabled]
- SATA2 Secndry RAID [Disabled]
Does that look like it would work OK?
(Seriously, guys, I know it's frustrating talking to a complete n00b like me who probably doesn't know enough to listen properly, but really, you've been great, and if you're not already making heaps of cash from your expertise, why not?!

)