Computer only starts when an ATA cable is switched

SAINT4084

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Dec 21, 2009
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I am running a custum built computer for an NVR camera survaillence system. It has four 1.5 and five 2.0 TB hard drives. It just recently crashed after running fine for six months. When I tried to boot it back up the error message "Reboot and select proper boot device or insert boot media" is displayed and I can't log into my Windows XP Proffessional OS (Service Pack 3). After several restarts, resets, and power off/on attempts I was able to boot it back up and get into windows by switching the ATA cable out with one from another hard drive. Each time it restarts successfully it is because I switched the ATA cable on the drive with my OS another's (leaving the other drive disconnected), but if I try to start it again without switching cables the same error is diplayed. Physically the the cable and the inside of the computer look emacculent. I can't make any sence of this intermittent boot error and really want to understand why it is doing this. Can anyone give me an explanation, theory, or solution?

Computer Specs
-Four 1.5 TB Hard Drives (Seagate)
-Five 2 TB Hard Drives (Seagate)
-Intel Core 2 Quad CPU 2.83 Giga Hertz
-4 GB PC16000 2000 MGH DDR 3 Ram (OCZ SLi Nvidea)
-ATI Radeon 512 Mb
-Asus P5Q3 Delux Mother Board
-1000W Power Supply

The drives are dynamically spanned.