Problem booting Debian amd64 3.1r0a

[Alex Page <alexp@transitive.com>]

I'm trying to install Debian amd64 3.1r0a on a dual em64t Xeon box, with 
SCSI hard drives and an IDE CD-ROM. I've previously had Debian i386 
running on the same hardware.

Once I've completed the base install from CD, I'm prompted to reboot 
into Debian. When I boot my Debian amd64 kernel, the boot process hangs 
with the following error message:

   Detecting hardware: open_sock(): No such device

I've tried Googling for this error message but not found anything 
illuminating. Any suggestions on where I can proceed from here?

Alex