@Gary_G:
cpus=1 ( <--- I don't think you need this )
arch=x86_64 ( <--- by default with boot file, it's on already I mean 64 bit )

I case you cannot boot to the system try -f to force load new kexts

Then use AppleJack or pfix to chean Cache + fix permission and then you can boot without -f...

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10.6.2 Pcj 64-bit kernel | Mobo Asus P5LD2-VM Revision 1.03 945G/ICH7 Graphic Intel GMA950 | CPU Pentium 4 630 3 GHz HT
Sleep never wake up, Quicktime 64-bit crashed

10.6.2 Vanilla | Mobo GigaByte GA-EP43T-UD3L | CPU C2D E7500 | GPU GigaByte GV-N240D3-1GI Nvidia GT240 ( Full QE/CI )