+ 0 Votes Have you tried booting with only the smaller HDD? wizard57m-cnet Updated - February 2, 2013 at 10:50am PST Rather than with both HDDs, try booting with only the smaller drive. It could be something simple like the master boot record needing fixed. If it will not boot with only the smaller drive, then try booting from the WinXP installation disk and see if it will detect the drive and offer to format if needed, and make it bootable. After that, power down and install the larger drive, bootup and check BIOS to make sure the smaller drive is preferred boot drive, then reboot and see if it works. Try not changing the cables too. Leave the primary cable attached to the smaller drive.