Trouble With Multiple Hard Drives

My husband set-up a dual hard drive system for me before he deployed to Iraq. It worked fine for several months until I overheated and blew the power supply. He instructed me to pull the power supply from his computer and put it in mine. I got everything hooked-up exactly the same I think. Now when I try to boot the computer I get a message that there is no disk reserved for RAID use and RAID is disabled. When it completes the boot process, the second hard drive is not listed anywhere in my computer that I can see. I have unplugged things several times and rearranged cords thinking that maybe I had done something incorrectly. Can anyone help? I really need the data that was stored on that drive.