If it fails to detect in BIOS, set the jumpers right. Try the primary drive as Master with slave and the new one as Slave, and if that fails try both in Cable Select. When you boot up, insure that your BIOS is set to recognise both drives on your primary IDE channel.
If it recognises in BIOS but not in Windows, you need to use drive administration (FDISK in Win9x and Drive Admin in XP/NT) to partition and format the empty drive.