I just went from WIndows XP to WIn 7 on a Dell 630. Had no problem installing the new WD drive & Win 7 but having issues getting the computer to recognize the previous drive. The new HD is SATA 0 and the 2 DVD drives are SATA 1 and 2, leaving SATA 3 for the remaining drive. The BIOS does not recognize it - what could be the problem? There are 4 HD bays and 4 sets of SATA cables in the computer.