Hello:

Same problem here with EFI installation. I also have an Amd Sempron. I don't know it matters of not.
The first attempt to install EFI was using an efi directory in the destination partition and booting in single mode user as described on page 3 of this thread. The startupfiletool seems to find the hfs partition but nothing changes when i reboot the machine.
The second attempt was using an usb flash. I run the startupfiletool from another leopard disk using the method described above by eddie11c. The startupfiletool seems to find the destination hfs partition, but when i try to boot from this partition the computer reboots. On the destination partition i have the 9.2.0 kernel included on the 10.5.2 amd update by eddie11c.

So I can't boot anymore from this partition! Any help?

Thank you all.

Dani.