This may help:
http://h30499.www3.hp.com/t5/Windows-Server-2003/Base-System-Device-Drivers/td-p/4242368#.UhOANz8t2LM
most likely the ILO driver is missing.
This may help:
http://h30499.www3.hp.com/t5/Windows-Server-2003/Base-System-Device-Drivers/td-p/4242368#.UhOANz8t2LM
most likely the ILO driver is missing.