Problems installing AIX on vio

I've been trying to get AIX 5.3 installed on a vio partition. I tried one partition that I created, and another one that already had AIX 5.3 on it. In both cases, the install seems to be successful, but when it tries to reboot, it gets to the kernel starting phase, I can see the kernel size, and it freezes. The HMC shows an LED code 554, which is supposed to mean

"The boot device could not be opened or read, or unable to define NFS swap device during network boot."

So I booted from CDrom into maintenance mode, let it mount up all of the filesystems, and they were all just fine. The boot device shows up, no problem. What could possibly be going on?

thanks

-denise mccracken