I have a Asus A8N-SLI with the latest Bios update. The only option I can change in the bios is ACPI enabled/disabled and S1 or S3.
I tried every combination without success.

BTW: I'm typing this from my iATKOS Leopard 10.5.1 with the AMD patch. Here everything works fine, and did the installation without any change from bios. But it feels a little slow, don't know why, maybe I'm just crazy.

Thanks guys!!

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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