No OS image was detected by firmware.
 At least one disk in the bootlist was not found yet.
 Firmware is now retrying the entries in the bootlist.
 Press ctrl-C to stop retrying.

You will see this message if the server couldn’t find a good boot device. reboot and hit one to start SMS. If this is a new install and you are trying to do a network boot, then you didn’t set up Remote IPL correctly, or you didn’t try to boot from the network device.