i have tried installing Zephyroth' Leopard-10.5.2-AMD-EFI-Rev2 various times but it always says Still waiting for root device. below are my specs, any ideas?

West Digital 320 IDE harddrive
Msi 761GM2-V mainboard (http://global.msi.com.tw/index.php?func=proddesc&prod_no=1033&maincat_no=1& cat2_no=171&cat3_no=6)
Nvidia Geforce 6200 LE
AMD athlon 4200+

Zephyroth' Leopard-10.5.2-AMD-EFI-Rev2