applenforceata found 0 units

1st i'll explain how i boot the retail dvd

i do not change anything in the bios as i follow the Devout guide [AMD] 10.6.7 Guide - written by Devout - InsanelyMac Forum

i used BootCD to boot into chameleon

and then i insert the retail dvd

in his guide, he says just put -v in the boot and my monitor turns black and the graphics card fan maxed out

next i try with boot GraphicsEnabler=No maxmem=4096

my graphics card fan doesnt maxed out but i stuck at the applenforceata

it shows still waiting for the root device

sometimes it shows applenforceata found 1 unit and then it show applenforceata found 0 units

what to do next?

i have ASUS M4N68T-M V2, Sapphire HD 6850 and snow leopard retail 10.6.3