OSx86 install works, fails back to BIOS during boot

[zon]

Hi. I just installed iDeneb 10.5.5 and the install went great.
I use Grub and it boots up the darwin bootloader on my OSx86 partition
with no problem.

When I try to boot with -v, I see the bootloader listing all the kexts it
is loading from HFS+ files. It gets through a list of them and then
there is a pause, the screen turn black, and BOOM! The screen turns
black, and I'm back in the BIOS, which takes me back to Grub.

I've tried various combinations of -x and -s and I still don't get a
shell prompt or any behavior other than this. Suggestions as
to how to proceed are very welcome.

Thanks very much!

My Configuration:
Sony PCG-Z1RAP(UC) Notebook
Intel(R) Pentium(R) M processor 1500MHz (sse, sse2)
display: ATI Radeon Mobility M6 LY
Intel 82801DB PRO/100 VE (MOB) Ethernet Controller
Intel PRO/Wireless LAN 2100 3B Mini PCI Adapter
Intel 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller
memory size: 1GiB