I have a Gigabyte motherboard 875KNXP Ultra with installed SCSI controller. I had a Sea Gate LW ST373307 SCSI hard disk installed on it. My WIndows XP Professional crashed and even after many attempts I was not able to restore it. Therefore I decided to go for a fresh reinstallation. To save data and have a back up for the future I purchased a SCSI SeaGate LW ST3146807 disk. I attached this new hard disk to the SCSI cable. However now the computer does not read from the SCSI hard disks. I detached the new SCSI hard disk from the computer leaving only the old SCSI hard disk but now the computer does not even read from it the original SCSI hard disk. I read the Cheetah instalation but do not really understand it. I am deeply worried as to what I have done. This computer is the server.