I am trying to install NetBSD 1.5 on a PowerBook 3400c. However, every 
time I try to boot from OpenFirmware, I am confronted with the following 
error message:

unrecognized Client Program formatstate not valid

I am attempting to load from a pure IS0-9660 CD that I burned from the 
bootable image available online.

Anyone have any suggestions? I know that OpenFirmware can read the CD 
because the dir atapi:\ command is successful in listing the contents of 
the drive.