MacPro with Snow Leopard will not boot

This morning, something odd is happening. Last night, when I sent to bed, my computer was fine, but this morning, when I tried to power it on, it tried to power up and then shut off. Does it every time. When booting from the normal start up disk, the startup chime is heard, then the apple logo appears for a few seconds, the machine clicks a few times and then shuts off.
When I hold down the option key on startup, I can see the boot drive options. So, I tried booting for a CD/DVD, but when I do, it just hangs and never boots. Disc drive spins for a second like it's trying to, but then winds down and hangs on the gray screen. However, I can boot from my Bootcamp drive (not a partition, but an actual, physical drive), and run Windows fine. Even when I try booting with Extensions off (holding Shift on boot up), it still hangs.
I've tried clearing PRAM, unplugging all USB accessories and even removing all non-essential PCI cards, and still nothing.
This is very bizarre. What would keep the Mac OS booting, but not the bootcamp stuff?
Any thoughts?
Russ

I have my system drive backed up. I tried pulling the system drive, inserting a new blank drive and booting from the Snow Leopard install disk to install the OS from scratch. It still won't boot from the DVD OSX install disk, even with the other system disk removed.
The problem seems to be that when booting from anything OSX, the system won't boot, but when booting from Bootcamp, it'll boot fine.
From the Windows side, I can see the Mac startup drive and all the files, so that disk is readable, at least. Just not bootable.
I talked to Apple tech support as well. They can't figure out either. Headed to the Genius bar this afternoon. Maybe they can figure out.
Russ

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1. Is it possible that the data and the Apps have been restored but the OS is simply corrupt on the TM?
Welcome to Apple's discussion groups.
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Unfortunately, Acomdata's record on the matter isn't quite clean*:
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