> This is strange. Do you remember the exact commands you had to give > Grub to get it to boot on the 9400? Because it sounds like the USB > drive is not being mapped as hd0 when booting from the USB drive on > that machine. That would be a strange BIOS problem... Well, I wrote down in paper some of the differences with the John's document and the relevant part was: grub> cat (hd0,2)/boot/grub/tester (and it worked) grub> kernel (hd0,2)/boot/vmlinuz-2.6.23.1-42.fc8 grub> initrd (hd0,2)/boot/initrd_usb.gz grub> boot (and booted ok) and the current grub configuration, which seems to work (allways) on the D620 is timeout=10 title Fedora8initial kernel (hd0,2)/boot/vmlinuz-2.6.23.1-42.fc8 initrd (hd0,2)/boot/initrd_usb.gz title Fedora8-2.6.23.9-85.fc8 kernel (hd0,2)/boot/vmlinuz-2.63.9-85.fc8 initrd (hd0,2)/boot/initrd-2.6.23.9-85.img The partions in the usb disk are: sda1 - NTFS sda2 - swap sda3 - Linux Regards, Miguel.