Hi dudes!
Here is my PC:
GA-P35-DS3L (rev. 2.0)
DualCore Intel Core 2 Duo E8200, 2666 MHz (8 x 333)
NVIDIA GeForce 9600 GT (512 Mb)
HD1: WDC WD6401AALS-00L3B2 (640 Gb) (SATA)
HD2: SAMSUNG HD103UJ (1000 Gb) (SATA)
DVD-RW (IDE)
1 GB *4 DDR2 800 МГц
Realtek ALC888 @ Intel 82801IB ICH9 (I don't use it on Win, and not planing to use it on Mac)
Also I got: FireWire expansion PCI card, external audio M-Audio FW410 (FireWare), mouse Microsoft (Wireless Laser Mouse 5000) (USB), kb Genius ErgoMedia 700 (USB), and XBox360 wired gamepad.

HD partitions showed here:


And fresh downloaded "MAC OS X Snow Leopard 10.6.6 HAZARD" iso written on DVD.

In DIOS ACHI support enable, USB legasy disable.
Try to install -v and get:


Hm... Any advices?)
Thanks)


UPDT:
Here is my BIOS settings:


OK, you can advice set SATA in Native mode, but I've tried it also. No result. Still waiting for root device.

I had that errora while back and was told to put SATA into AHCI mode? Not sure if you already have/had done, but if not, its worth a shot. If you don't know how, check your motherboard manual.