I decided to do a complete reinstall of SL and update to 10.6.4. I have had my system running 10.6.1 vanilla perfectly (except auto sleep) in 64 bit following the OP's directions.

This time I used MultiBeast to install SL. I left the <string> for "Kernel Flags" blank in my Boot.plist (as I did before) to boot in 64-bit, but after the Apple logo screen with the circling chasing bars, I never get to the desktop, but instead, I freeze on a blank blue screen. But when I put in "-x32" on the Chameleon screen, I am able to boot into the desktop.

When I type in "ioreg -l -p IODeviceTree | grep firmware-abi" in Terminal, I get ""firmware-abi" = <"EFI64">." So I should be able to boot in 64-bit mode.

How come a system that ran in 64-bit mode under 10.6.1, will not run in 64-bit mode under 10.6.4? I tried using the same boot file, smbios.plist, boot.plist, fakesmc, and much more to get it to work under 64-bit mode.

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Gigabyte G31M-ES2L rev. 2.0
Intel E6300 2.8MHz
1GB OCZ DDR2 800MHz
Asus WL-138G v2 (WiFi)
WD 250GB SATA II
Gigabyte 7600GS 256MB