Issue: After passing various installation obstacles, the bootload hangs at a blinking cursor "_" .

Solution:
Boot with the DVD and use -s at boot load.

sudo -s
fdisk -e /dev/rdiskX --->(X is the number of your HD, if you have only on its 0)
update
f X --->(X is the number of the partition where you installed Leopard)
w
q
reboot

Mentioned with Kalway release: the bootloader does not like seperate disk names. Use a single word as name.