The dvd that you are trying to restore from has a specific set of drivers installed in the kernel. There is quite possibly a conflict between those drivers and the new motherboard.
At some point...
If it stops before it has completely loaded the kernel into memory, then there is always the possibility that the motherboard is incompatible.
Have you tried installing the operating system on this...
The file containing the boot strings is missing from the dvd. You will have to modify the backup process so that the file is added to the dvd.
The alternative is to remove the word "defbootstr"...
Something I forgot to mention.
If you reboot the new system, you will have to continue to use the biosgeom boot prompt until you run "dparam" and permanently replace the parameters.
If the backup is an image file of the original disk, then it may require the target to have the same disk geometry, or at least have the same number or sectors per track.
Can you explain the...