Hi Larry,
No, unfortunately I have not been able to resolve this. The suggested Novell CD was not able to execute correctly on the Z800, so no progress towards incorporating the correct drivers (if that is the issue).
I've raised the issue internally (I work for HP), but so far no positive news here.
Even though this model is a workstation rather than a server, it does seem strange that it is not supported out of the box. It is certainly powerful enough to run ESXi for our purpose.
Any further hints from anyone would be greatly appreciated,
Regards,
Jens