Install problems: USB, SATA on Dell 3100

I'm trying to install debian 3.1 on a dell dimension 3100. By using the 2.1.2006 testing release, I can get my hard disks recgonized.  However, the USB keyboard is seen by the installation program, but once the installed system boots the keyboard is not seen.  I have to use a USB keyboard and mouse

Installation on Dell 3100 - No Partitionable media were found

I'm trying to install Sarge 3.1 on a Dell Dimension 3100.  At the partition step, I get the error "No Partitionable media were found".  According the the BIOS setup, the controller is Serial ATA, port SATA-0, and the drive is a WDC WD800JD. Any thoughts on how to proceed?