Booting Debian GNU/kFreeBSD on MacBookPro 8.2

[Lars Noodén <lars.nooden@gmail.com>]

I've installed Debian GNU/kFreeBSD 7.6 (wheezy) from a mini.iso CD image 
on a MacBookPro 8.2.  The installation seemed to go smoothly, including 
installing Grub, but when it is time to boot, the machine only ever 
shows a blinking folder with a question mark, indicating no system.  The 
system can be booted from the installation CD via the choice to boot 
from first hard disk, so that part of the installation worked.

What additional step is needed so that the system boots on its own from 
the internal drive without intervention from the installation CD?

Regards,
/Lars