Problem! Help me!

[kostis papa]

Hello,
I have a problem with installation.
I choose country, keyboard and then I can  not  continue  installation,
because  it says "No disks found! Please verify that your disk controller is
being ....."
My pc is new (core 2 quad, sata 500-SeaGate)
I have installed the windowsXP and ubuntu-Linux (I didn't have any problem)
and I would like to install freebsd!
I have read the documentation and I don't know what can I do....
Please help me!
Thank you very much!