FreeBSD 4.10 install freeze

[Frédéric Hardy]

Hello !

After the kernel configuration, computer freeze on :
 > Mount root from ufs:/dev/md0

The CPU is a PIII 500 with one floppy disk, one ata disk, one ata CD-ROM 
and 128 Mo RAM.
Motherboard has SCSI, but only ata driver was loaded during the boot 
process.
Pnp OS was disabled in BIOS.
APM and ACPI was disabled in BIOS.
Sysinstall freeze from floppies and CD-ROM.

Any solutions ?

Best regards

Fred