Someone

Hello I am installing linux on a custom built pc  2gb ram, intel pentium 4 3.0ghz processor, WD sata (Secondary)320 gb, Hitachi (IDE, Primary)80gb, MSI PTneo fsr 880, DVD/Cd drive, Nvidia 6200 

I have checked http://www.sabayonlinux.org/ to see if they had anything listed but they didn't explain it well enough there.

I have installed sabayon succesfully on my ibm think pad pc but seem to have issues on the custom PC.
I am running into a problem at the install screen:
!! The root block device is unspecified or not detected.
Please specify a device to boot, or "shell"for a shell...
boot() ::