MSI K8T Neo2Board: GRUB not recognized by BIOS, FreeBSD- Bootloader is

[rainer herrendoerfer]

Hello list,
I'm not really shure if this is a real GRUB problem, but to me it looks 
like. I tried to install Debian on an USB pendrive attached to an MSI 
K8T Neo2 mainboard with GRUB, but on reboot the MSI BIOS (AMI version 
3.3) moans >>no bootable device detected<<.
The odd thing is: in all cases another board was able to boot the pen 
without any problems. Even dd stage 1 and 2 onto the stick was useless.
BUT: I put a FreeBSD on the same stick and whithout any changes this 
Bootloader was recognized imidiately and booted without any problems.
I tried LILO as well, didn't succeed either.
Does anybody have experience with that board?
Tricks, tweaks?

Any help apreciated
Rainer