Mac Pro doesn't recognize any internal drive

My Mac Pro (2008) -- after rebooting -- does not recognize any of the internal drives. I'm running 10.6.8 and all of a sudden after reboot, the machine hangs on grey screen and I get folder w/ question mark symbol. I boot from Snow Leopard install disk but no drive shows up as being able to reinstall on. Even opening up Disk Utility from Snow Leopard disc shows no internal drive.
Any ideas?

Just a few additional random thoughts on this Hardware:
A SATA controller failure should take out all SATA drives. On the 2008 model, the Optical drives are IDE/ATA, but there are two additional SATA ports (data only) on the motherboard.
In the 2008 and previous models, the Mac Pro RAID card uses a cable called iPass to intercept the essential signals to the four Hard Drive bays and route them through the RAID card. If that iPass cable were to come loose, the four main drive bays would stop working.

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Tdc3, welcome to the forum,
change the BIOS settings in Config > SATA to Compatibility Mode from AHCI.
Andy ______________________________________
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