Another thought that I had was that you said you could boot from the
NetBSD cd or the NetBSD installed on the hard disk, but couldn't boot from
the OS X cd from Apple.  This may be a third stupid question, but have you
tried booting the Bootcamp cd, which I believe has utilities to configure
your mac in various ways.  If you can boot from the Bootcamp cd, perhaps it
can then restore functionality required to let OS X boot.
-Brian

On Nov 6,  8:59pm, "Marco Trillo" wrote:
} Subject: Re: Inverted boot problem for a Mac Mini
} Hi,
} 
} On 11/6/07, Johan Ihren <johani@johani.org> wrote:
} > -----BEGIN PGP SIGNED MESSAGE-----
} > Hash: SHA1
} >
} >
} > On 6 Nov 2007, at 03:19, Jared D. McNeill wrote:
} >
} > > On Tue, 6 Nov 2007, Johan Ihren wrote:
} > >> So, in short: Doesn't listen to the keyboard at all during boot,
} > >> doesn't boot Mac media (HDD or DVD) but does boot NetBSD media
} > >> (HDD or CD). I'm stuck with NetBSD ;-)
} > >
} > > Maybe a stupid question, but have you tried holding down the option
} > > key while powering on?
} >
} > Yep. I've tried every magic keypress I've been able to squeeze out of
} > Google. Pressing any combination of keys while booting is a no-op.
} 
} This is also a stupid question, but are you using a USB keyboard
} (i.e., no Bluetooth or so) to press the Option or the C key ?
} 
}      -Marco
>-- End of excerpt from "Marco Trillo"