Bios doesnt see my sata hard drive, when my IDE drive is connected

Hello,

I recently had to reformat my C drive (again), because of some dumb Windows XP screw-up. I successfully reinstalled Windows XP on my sata C drive. Everything here is fine, except:

When I plug my IDE slave D drive in, while the sata C drive is also plugged in, Bios does not list my sata C drive. It seems that the IDE slave drive takes priority, because the sata C drive is not even detected. Of course, I need them both to be detected, but bios doesnt even display the C sata drive when I am trying to boot windows xp off of it, or when I try to change the boot order.

My question is, how do I get bios to see both of my drives? How can I have it see the Sata drive while the IDE slave drive is plugged in?

Thanks kindly for your help.

Jack