You'll have to edit com.apple.boot.plist that as you're using chameleon 2RC1 is located in /Extra.
Inside that plist look for this:

<key>Kernel</key>
<string>mach_kernel</string>

And change mach_kernel for mach_kernel.voodoo.

Good luck!!

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CPU: AMD Athlon 64 3000+ @2.3Ghz - Motherboard: ASUS A8N-SLI nForce4 SLI - nForceLAN by eno - SuperNForceATA by Medevil - RAM:2 GB DDR 333Mhz Audio: ALC850 Video: XFX nVidia GeForce 8400GS 256Mb (0x06e4) QE & CI from Chameleon 2 RC4Ethernet: Realtek RTL 8139 Series (working out of the box) OS: Snow Leopard 10.6.4 (aryajuanda's guide) + Windows XP 64bits