Troubles to install debian in a Machintosh

["Fernando R. Fernandes" <kinner@kinner.com.br>]

Hello, I have a problem about Debian installation in a macintosh 
performa 6360.
I have installed the system to run in text mode, but I can’t install 
graphic model that are into Debian CD. While basic installation, I 
couldn’t obtain access by CD too, then I had to make a copy of CDs in my 
hard disk, after this it was possible to follow with installation, so I 
am not getting any results using apt-setup when I ask to run Debian CD 
and is showed a message saying that cdrom device was detected but does 
not seem to have a Debian CD in it. .
What steps can I follow to progress with Debian Installation in my computer.

Ps.: My CDs are Debian official CDs purchased with authorised vendors .

Thanks.