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You only need to check the "Enable access for assistive devices" box, actually; the script needs it to function properly. You can find CHUD.pkg in Leopard_Install_DVD->Optional_Installs->Xcode_Tools->Packages (see picture)
I tried poweroff_fix to find that sometimes it works and sometimes it doesn't. So I made a simple AppleScript (Shutdown_1Core_Eng.app) that has worked flawlessly for me in the last few days. Anyone willing to give it a try at his/her own risk should follow these directions (with pictures): 1_ Install CHUD.pkg 2_ Set Universal Access as shown 3_ Double-click on ProcessorPrefPane to install 4_ Double-click on Shutdown_1Core_Eng.app Hopefully you'll get something like the biggest .png attached: only one core running (see menubar) and a complete shutdown after a few seconds. Put the Script in the Dock for easy access, also put CPUPalette in the Dock to see what happens to your Cores. The script is editable, adding a few lines will make it work with 4Cores, too. It works with 10.5.3 and 10.5.2, should work with Tiger My rig: Asus P5k-VM, Intel Core2 Duo 3GHz, 3GB SDRAM, GeForce 7300 GS 256MB, Kalyway 10.5.2 Shutdown_1Core_Eng.app.zip