Dell systems work better on Cable select. Try setting it like that, with the master drive on the black connector, and the slave drive on the grey connector. It should work out like that. After you've done that, go into your BIOS, and light up the NumLock, CapsLock, and ScrollLock lights on your keyboard. Hold <Alt>+F, then hit <Alt>+E. After it stops beeping, hit <Alt>+B, and this will restart your system. That procedure sets your BIOS back to defaults, and it should force the system to redetect all of the IDE drives.