|I think so. The bios and posting screen (if that's enabled) should show all the drives regardless of whether you plan on booting from them. And I guess by 'reprogram' you mean 'install XP'.|
I assume the bios can see a 40 gig drive OK. There's some discussion on that here:
Check in cmos/bios setup and make sure the IDE controllers are enabled. Check that the hard drive's power and data cables are in good condition and tightly connected. Try a different power connector as sometimes the contacts in the molex connector get flared out and don't make good contact with the drive's pins.
I guess you're using the 80-wire IDE cable (if not, you should be). Note the black, blue and gray connectors. Blue connects to the motherboard and black to your drive. A second slave drive would connect to the gray one, otherwise nothing goes there.
You're using cable select but you may as well also try jumpering it as master. As jam mentions above, most WD drives are 'no jumper' when they're the only one on the cable.
Now that's what I call a sticky situation