Installing Debian using USB Key

[Mathieu Malaterre <mathieu.malaterre@gmail.com>]

Hi there,

  I am trying to setup a machine without a CD drive. So I thought the
simpliest would be the USB solution:

http://d-i.alioth.debian.org/manual/en.i386/ch04s03.html

  I followed the steps and did:

wget http://d-i.debian.org/daily-images/amd64/daily/hd-media/boot.img.gz
zcat boot.img.gz > /dev/sdX
wget http://cdimage.debian.org/debian-cd/5.0.3/amd64/iso-cd/debian-503-amd64-netinst.iso
cp debian-503-amd64-netinst.iso /media/KINGSTON
sudo install-mbr /dev/sdX

When I start the other computer with the USB key in, it display "MBR
1234FA:" and then just stops...

Is there a way to debug or see what is going on ?

Thanks,
-- 
Mathieu