raid 0 member dropping

Everything was fine dell precision 650 on board LSI 1020/1030 scsi controller, then 1 day it was at the bios screen saying that the array way not optimal.  In checking this I found drive SCSI #4 "disk Missing".  I presummed it was dead, but I moved it (the id# 4 drive) over to another dell 650 and enabled the SCSI Controller in the Bios and scanned for devices and low and behold it found the drive.. EVERY TIME!  So I thought the controller on the mobo was defective, so knowing that BOTH systems were identical except for the secound one that I was testing with we are using a SATA Raid controller and not the onboard LSI controller, so I MOVED EVERYTHING, video cards, memory, sata-SCSI really exchanged the two machines as far as the HD configurations.  Guess what i booted with the (NEWER) 2nd dell 650 that the SCSI's were now in and the EXACT same error occured!!  I then found out that if I left all other drives off except the (defective/missing member)  the controller would find it perfectly????  But if I add the members back in (IN ORDER) then it always says that particular disk is missing!!!

Please Help... I was going to image EACH and every drive 1 at a time and used some 3rd party software to re-create my array, so I can get my data, but nothing I've found actually see's the LSI single drive even though it's in the device manager..  The order of the arrays are the same, I have NOT written ANYTHING to the drives yet.