> It came up with the usual loading Stage 2....but got
> no further, so at least it reads the DVD and tries to
> boot from it.

It hangs in GRUB's gateA20() subroutine, called from 
usr/src/grub/grub-0.95/stage2/common.c function init_bios_info(), here:

http://cvs.opensolaris.org/source/xref/on/usr/src/grub/grub-0.95/stage2/asm.S#1821

   1821 gloop1:
   1822         inb     $K_STATUS
   1823         andb    $K_IBUF_FUL, %al
   1824         jnz     gloop1

The Intel chipset used on the Intel Mac probably doesn't have a PS/2 legacy
keyboard controller any more, so the "inb $K_STATUS" (== inb 0x64) must be
returning 0xff bytes ==> we're stuck in an endless loop.
 
 
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