@frisco2,
I put the HDD (I have 3 partitions in this HDD. 1 with files, 1 with the 10.6.3 installed with chameleon and 1 with files) in the SATA 1 port of my motherboard and i checked again your settings for the BIOS (my motherboard doesn't have SATA 3 ports), but still the same result ("still waiting for root device"). I also disconected my Windows HDD, disconected the Snow Leopard HDD, tried with other kernels but still the same. What else i must check?