Sorry to reply you so late.
I think you should active your disk partition.
First, when you installed, you formatted (erased) the partition using Disk Utility. Attention, you should choose MBR（Option in the Partition tab of Disk Utility）
after your installation
boot with your Leo DVD,

Press -S
fdisk - e /dev/rdisk0
flag X(your leo's partition)
update
write
reboot

FYI, there is a excellent guide for you http://www.insanelymac.com/forum/ind...owtopic=149505
You should check it out, and maybe there is something can help.