but theres no hd0: or cd0: in the early startup control,
and when i boot the 31 install disk my HD isnt displayed.!
There will only be HD entries on the Amiga after the harddrive has been prepped.
After prepping the harddrive, you reboot the computer, load Workbench through disk (Workbench or Install disk) and format the partitions created. If they don't show up, run HDToolbox and try creating a bootable 250 MB partition, and remove the rest and try again.
You will only be able to get CD entries if you connect a CD drive to the SCSI controller of the PPC board.