Robin,
I asked my DH who knows about these things and he said you should check your BIOS setting to see if the BIOS is seeing the drives. If not, it could be that your IDE cable has been incorrectly connected to the motherboard. Also, you need to check your link settings on the drive (these are what tells it if it's a master or a slave unit.
If you use Windows it might also be worth checking out the FAQ section on their site.
Hope this makes more sense to you than it does to me

.
If you need any clarification let me know and I'll pick his brains again.
Pam.
