If the drive is seen in BIOS but not in Windows, then this should resolve:
http://support.microsoft.com/kb/314060
If the drive is not seen in BIOS, Reseat the power and data cables, and reboot and see if the drive is seen. If not, then boot to BIOS, turn on Caps Lock, Scroll Lock, and NUMLOCK, then press ALT+E (system should Beep once), Then Alt+F (Beep) then ALT+B to reboot Then gp back to BIOS and see if the drive is seen.
If drive still not detected, replace the drive
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