Cannot boot FreeBSD (8.0) from USB stick (Dell Inspiron 9400)

[Christoph Kukulies]

I installed FreeBSD 8.0 on an USB-stick and was able to boot it on my 
Desktop PC and install 8.0
from it.

Now I plugged the same stick into my Dell Inspiron 9400 and the USB 
stick (2GB) is not even listed in the F12 Bios boot menu.

Any clues?

--
Christoph