775 motherboard support win2003 server

I had a win2k3 installation copied from an old HP Vectra machine to an IDE drive partition.
That worked fine (the MOBO was a ASDROCK 4coredual-VSTA - the 775DUAL-VSTA should work also)
until my IDE drive died!

Now I am trying to get a diskimage working on an internal SATA disk instead.
This fails with a "disk read error press CTRL_ALT_DEL".
I am searching around and as I can access the disk using UBCD4WIN.
I could update the MBR and the bootrecord using UBCD4WIN but its still not working!!!

I am a bit confused that I cannot boot win2k3 from the SATA drive!

However, this might be the end of compatibility and supported OSes.

Anyone any ideas to this?