Comment 14 for bug 64133

Joachim,
Can you examine the following link?:
http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1209379186243+28353475&threadId=200797
In particular the section regarding the following:
/QUOTE{
    0. Boot To System Configuration Utility (F10)
    1. At main menu press Ctrl-A (or Ctrl-Q) to activate Advanced mode
    2. Select System Configuration
    3. Select Hardware Configuration
    4. Select View and edit details
    5. Change APIC Mode to Full Table (or Full Table Mapped)
}/ENDQUOTE

Reply:
 "The APIC setting was the problem. The proper setting (in this circumstance) was FULL TABLE not FULL TABLE MAPPED. I've now got a proliant 3000 server running dual 550s."

Your system is a little different but similar APIC change maybe worth a try.